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Diffstat (limited to 'lib/snprintf.c')
| -rw-r--r-- | lib/snprintf.c | 1139 |
1 files changed, 863 insertions, 276 deletions
diff --git a/lib/snprintf.c b/lib/snprintf.c index aca8df9..cdf6513 100644 --- a/lib/snprintf.c +++ b/lib/snprintf.c @@ -2,180 +2,616 @@ #ifndef HAVE_SNPRINTF -/*************************************************************************** - * LPRng - An Extended Print Spooler System - * - * Copyright 1988-1997, Patrick Powell, San Diego, CA - * papowell@sdsu.edu - * See below for conditions of use. - * - *************************************************************************** - * MODULE: snprintf.c - * PURPOSE: LPRng version of printf - absolutely bombproof (hopefully!) +/************************************************************************** + * Copyright 1994-2003 Patrick Powell, San Diego, CA <papowell@lprng.com> **************************************************************************/ -#if 0 - The "Artistic License" +/* + Overview: - Preamble + snprintf( char *buffer, int len, const char *format,...) + plp_unsafe_snprintf( char *buffer, int len, const char *format,...) + its horribly unsafe companion that does NOT protect you from + the printing of evil control characters, but may be necessary + See the man page documentation below -The intent of this document is to state the conditions under which a -Package may be copied, such that the Copyright Holder maintains some -semblance of artistic control over the development of the package, -while giving the users of the package the right to use and distribute -the Package in a more-or-less customary fashion, plus the right to make -reasonable modifications. + This version of snprintf was developed originally for printing + on a motley collection of specialized hardware that had NO IO + library. Due to contractual restrictions, a clean room implementation + of the printf() code had to be developed. -Definitions: + The method chosen for printf was to be as paranoid as possible, + as these platforms had NO memory protection, and very small + address spaces. This made it possible to try to print + very long strings, i.e. - all of memory, very easily. To guard + against this, all printing was done via a buffer, generous enough + to hold strings, but small enough to protect against overruns, + etc. - "Package" refers to the collection of files distributed by the - Copyright Holder, and derivatives of that collection of files - created through textual modification. + Strangely enough, this proved to be of immense importance when + SPRINTFing to a buffer on a stack... The rest, of course, is + well known, as buffer overruns in the stack are a common way to + do horrible things to operating systems, security, etc etc. - "Standard Version" refers to such a Package if it has not been - modified, or has been modified in accordance with the wishes - of the Copyright Holder as specified below. + This version of snprintf is VERY limited by modern standards. - "Copyright Holder" is whoever is named in the copyright or - copyrights for the package. + Revision History: + First Released Version - 1994. This version had NO comments. + First Released Version - 1994. This version had NO comments. + Second Major Released Version - Tue May 23 10:43:44 PDT 2000 + Configuration and other items changed. Read this doc. + Treat this as a new version. + Minor Revision - Mon Apr 1 09:41:28 PST 2002 + - fixed up some constants and casts - "You" is you, if you are thinking about copying or distributing - this Package. + COPYRIGHT AND TERMS OF USE: - "Reasonable copying fee" is whatever you can justify on the - basis of media cost, duplication charges, time of people involved, - and so on. (You will not be required to justify it to the - Copyright Holder, but only to the computing community at large - as a market that must bear the fee.) + You may use, copy, distribute, or otherwise incorporate this software + and documentation into any product or other item, provided that + the copyright in the documentation and source code as well as the + source code generated constant strings in the object, executable + or other code remain in place and are present in executable modules + or objects. - "Freely Available" means that no fee is charged for the item - itself, though there may be fees involved in handling the item. - It also means that recipients of the item may redistribute it - under the same conditions they received it. + You may modify this code as appropriate to your usage; however the + modified version must be identified by changing the various source + and object code identification strings as is appropriately noted + in the source code. -1. You may make and give away verbatim copies of the source form of the -Standard Version of this Package without restriction, provided that you -duplicate all of the original copyright notices and associated disclaimers. + You can use this with the GNU CONFIGURE utility. + This should define the following macros appropriately: -2. You may apply bug fixes, portability fixes and other modifications -derived from the Public Domain or from the Copyright Holder. A Package -modified in such a way shall still be considered the Standard Version. + HAVE_STDARG_H - if the <stdargs.h> include file is available + HAVE_VARARG_H - if the <varargs.h> include file is available -3. You may otherwise modify your copy of this Package in any way, provided -that you insert a prominent notice in each changed file stating how and -when you changed that file, and provided that you do at least ONE of the -following: + HAVE_STRERROR - if the strerror() routine is available. + If it is not available, then examine the lines containing + the tests below. - a) place your modifications in the Public Domain or otherwise make them - Freely Available, such as by posting said modifications to Usenet or - an equivalent medium, or placing the modifications on a major archive - site such as uunet.uu.net, or by allowing the Copyright Holder to include - your modifications in the Standard Version of the Package. + HAVE_SYS_ERRLIST - have sys_errlist available + HAVE_DECL_SYS_ERRLIST - sys_errlist declaration in include files + HAVE_SYS_NERR - have sys_nerr available + HAVE_DECL_SYS_NERR - sys_nerr declaration in include files - b) use the modified Package only within your corporation or organization. + HAVE_QUAD_T - if the quad_t type is defined + HAVE_LONG_LONG - if the long long type is defined + HAVE_LONG_DOUBLE - if the long double type is defined - c) rename any non-standard executables so the names do not conflict - with standard executables, which must also be provided, and provide - a separate manual page for each non-standard executable that clearly - documents how it differs from the Standard Version. + If you are using the GNU configure (autoconf) facility, add the + following line to the configure.in file, to force checking for the + quad_t and long long data types: - d) make other distribution arrangements with the Copyright Holder. -4. You may distribute the programs of this Package in object code or -executable form, provided that you do at least ONE of the following: + AC_CHECK_HEADERS(stdlib.h,stdio.h,unistd.h,errno.h) + AC_CHECK_FUNCS(strerror) + AC_CACHE_CHECK(for errno, + ac_cv_errno, + [ + AC_TRY_LINK(,[extern int errno; return (errno);], + ac_cv_errno=yes, ac_cv_errno=no) + ]) + if test "$ac_cv_errno" = yes; then + AC_DEFINE(HAVE_ERRNO) + AC_CACHE_CHECK(for errno declaration, + ac_cv_decl_errno, + [ + AC_TRY_COMPILE([ + #include <stdio.h> + #ifdef HAVE_STDLIB_H + #include <stdlib.h> + #endif + #ifdef HAVE_UNISTD_H + #include <unistd.h> + #endif + #ifdef HAVE_ERRNO_H + #include <errno.h> + ],[return(sys_nerr);], + ac_cv_decl_errno=yes, ac_cv_decl_errno=no) + ]) + if test "$ac_cv_decl_errno" = yes; then + AC_DEFINE(HAVE_DECL_ERRNO) + fi; + fi - a) distribute a Standard Version of the executables and library files, - together with instructions (in the manual page or equivalent) on where - to get the Standard Version. + AC_CACHE_CHECK(for sys_nerr, + ac_cv_sys_nerr, + [ + AC_TRY_LINK(,[extern int sys_nerr; return (sys_nerr);], + ac_cv_sys_nerr=yes, ac_cv_sys_nerr=no) + ]) + if test "$ac_cv_sys_nerr" = yes; then + AC_DEFINE(HAVE_SYS_NERR) + AC_CACHE_CHECK(for sys_nerr declaration, + ac_cv_decl_sys_nerr, + [ + AC_TRY_COMPILE([ + #include <stdio.h> + #ifdef HAVE_STDLIB_H + #include <stdlib.h> + #endif + #ifdef HAVE_UNISTD_H + #include <unistd.h> + #endif],[return(sys_nerr);], + ac_cv_decl_sys_nerr_def=yes, ac_cv_decl_sys_nerr_def=no) + ]) + if test "$ac_cv_decl_sys_nerr" = yes; then + AC_DEFINE(HAVE_DECL_SYS_NERR) + fi + fi - b) accompany the distribution with the machine-readable source of - the Package with your modifications. - c) give non-standard executables non-standard names, and clearly - document the differences in manual pages (or equivalent), together - with instructions on where to get the Standard Version. + AC_CACHE_CHECK(for sys_errlist array, + ac_cv_sys_errlist, + [AC_TRY_LINK(,[extern char *sys_errlist[]; + sys_errlist[0];], + ac_cv_sys_errlist=yes, ac_cv_sys_errlist=no) + ]) + if test "$ac_cv_sys_errlist" = yes; then + AC_DEFINE(HAVE_SYS_ERRLIST) + AC_CACHE_CHECK(for sys_errlist declaration, + ac_cv_sys_errlist_def, + [AC_TRY_COMPILE([ + #include <stdio.h> + #include <errno.h> + #ifdef HAVE_STDLIB_H + #include <stdlib.h> + #endif + #ifdef HAVE_UNISTD_H + #include <unistd.h> + #endif],[char *s = sys_errlist[0]; return(*s);], + ac_cv_decl_sys_errlist=yes, ac_cv_decl_sys_errlist=no) + ]) + if test "$ac_cv_decl_sys_errlist" = yes; then + AC_DEFINE(HAVE_DECL_SYS_ERRLIST) + fi + fi - d) make other distribution arrangements with the Copyright Holder. -5. You may charge a reasonable copying fee for any distribution of this -Package. You may charge any fee you choose for support of this -Package. You may not charge a fee for this Package itself. However, -you may distribute this Package in aggregate with other (possibly -commercial) programs as part of a larger (possibly commercial) software -distribution provided that you do not advertise this Package as a -product of your own. -6. The name of the Copyright Holder may not be used to endorse or promote -products derived from this software without specific prior written permission. + AC_CACHE_CHECK(checking for long long, + ac_cv_long_long, + [ + AC_TRY_COMPILE([ + #include <stdio.h> + #include <sys/types.h> + ], [printf("%d",sizeof(long long));], + ac_cv_long_long=yes, ac_cv_long_long=no) + ]) + if test $ac_cv_long_long = yes; then + AC_DEFINE(HAVE_LONG_LONG) + fi -7. THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR -IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED -WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + AC_CACHE_CHECK(checking for long double, + ac_cv_long_double, + [ + AC_TRY_COMPILE([ + #include <stdio.h> + #include <sys/types.h> + ], [printf("%d",sizeof(long double));], + ac_cv_long_double=yes, ac_cv_long_double=no) + ]) + if test $ac_cv_long_double = yes; then + AC_DEFINE(HAVE_LONG_DOUBLE) + fi - The End -#include "lp.h" -#endif + AC_CACHE_CHECK(checking for quad_t, + ac_cv_quad_t, + [ + AC_TRY_COMPILE([ + #include <stdio.h> + #include <sys/types.h> + ], [printf("%d",sizeof(quad_t));], + ac_cv_quad_t=yes, ac_cv_quad_t=no) + ]) + if test $ac_cv_quad_t = yes; then + AC_DEFINE(HAVE_QUAD_T) + fi -#include <stdarg.h> -#include <errno.h> -#include <sys/types.h> -#define HAVE_STDARGS /* let's hope that works everywhere (mj) */ -#define VA_LOCAL_DECL va_list ap; -#define VA_START(f) va_start(ap, f) -#define VA_SHIFT(v,t) ; /* no-op for ANSI */ -#define VA_END va_end(ap) -/**** ENDINCLUDE ****/ -static char *const _id = "$Id$"; + NAME + snprintf, plp_vsnprintf - formatted output conversion + + SYNOPSIS + #include <stdio.h> + #include <stdarg.h> + + int + snprintf(const char *format, size_t size, va_list ap); + int + plp_unsafe_snprintf(const char *format, size_t size, va_list ap); + + AKA snprintf and unsafe_snprintf in the documentation below + + int + vsnprintf(char *str, size_t size, const char *format, va_list ap); + int + unsafe_vsnprintf(char *str, size_t size, const char *format, va_list ap); + + AKA vsnprintf and unsafe_vsnprintf in the documentation below + + (Multithreaded Safe) + + DESCRIPTION + The printf() family of functions produces output according to + a format as described below. Snprintf(), and vsnprintf() + write to the character string str. These functions write the + output under the control of a format string that specifies + how subsequent arguments (or arguments accessed via the + variable-length argument facilities of stdarg(3)) are converted + for output. These functions return the number of characters + printed (not including the trailing `\0' used to end output + to strings). Snprintf() and vsnprintf() will write at most + size-1 of the characters printed into the output string (the + size'th character then gets the terminating `\0'); if the + return value is greater than or equal to the size argument, + the string was too short and some of the printed characters + were discarded. The size or str may be given as zero to find + out how many characters are needed; in this case, the str + argument is ignored. + + By default, the snprintf function will not format control + characters (except new line and tab) in strings. This is a + safety feature that has proven to be extremely critical when + using snprintf for secure applications and when debugging. + If you MUST have control characters formatted or printed, + then use the unsafe_snprintf() and unsafe_vsnprintf() and on + your own head be the consequences. You have been warned. + + There is one exception to the comments above, and that is + the "%c" (character) format. It brutally assumes that the + user will have performed the necessary 'isprint()' or other + checks and uses the integer value as a character. + + The format string is composed of zero or more directives: + ordinary characters (not %), which are copied unchanged to + the output stream; and conversion specifications, each + of which results in fetching zero or more subsequent arguments. + Each conversion specification is introduced by the character + %. The arguments must correspond properly (after type promotion) + with the conversion specifier. After the %, the following + appear in sequence: + + o Zero or more of the following flags: + + - A zero `0' character specifying zero padding. For + all conversions except n, the converted value is padded + on the left with zeros rather than blanks. If a + precision is given with a numeric conversion (d, i, + o, u, i, x, and X), the `0' flag is ignored. + + - A negative field width flag `-' indicates the converted + value is to be left adjusted on the field boundary. Except + for n conversions, the converted value is padded on + the right with blanks, rather than on the left with + blanks or zeros. A `-' overrides a `0' if both are + given. + + - A space, specifying that a blank should be left before + a positive number produced by a signed conversion (d, e, E, f, + g, G, or i). + + - A `+' character specifying that a sign always be placed + before a number produced by a signed conversion. A `+' overrides + a space if both are used. + + o An optional decimal digit string specifying a minimum + field width. If the converted value has fewer + characters than the field width, it will be padded + with spaces on the left (or right, if the + left-adjustment flag has been given) to fill out + the field width. + + o An optional precision, in the form of a period `.' followed + by an optional digit string. If the digit string + is omitted, the precision is taken as zero. This + gives the minimum number of digits to appear for + d, i, o, u, x, and X conversions, the number of + digits to appear after the decimal-point for e, + E, and f conversions, the maximum number of + significant digits for g and G conversions, or + the maximum number of characters to be printed + from a string for s conversions. + + o The optional character h, specifying that a following d, + i, o, u, x, or X conversion corresponds to a short + int or unsigned short int argument, or that a + following n conversion corresponds to a pointer + to a short int argument. + + o The optional character l (ell) specifying that a following + d, i, o, u, x, or X conversion applies to a pointer + to a long int or unsigned long int argument, or + that a following n conversion corresponds to a + pointer to a long int argument. + + o The optional character q, specifying that a following d, + i, o, u, x, or X conversion corresponds to a quad_t + or u_quad_t argument, or that a following n + conversion corresponds to a quad_t argument. + This value is always printed in HEX notation. Tough. + quad_t's are an OS system implementation, and should + not be allowed. + + o The character L specifying that a following e, E, f, g, + or G conversion corresponds to a long double + argument. + + o A character that specifies the type of conversion to be applied. + + + A field width or precision, or both, may be indicated by an asterisk `*' + instead of a digit string. In this case, an int argument supplies the + field width or precision. A negative field width is treated as a left + adjustment flag followed by a positive field width; a negative precision + is treated as though it were missing. + + The conversion specifiers and their meanings are: + + diouxX The int (or appropriate variant) argument is converted to signed + decimal (d and i), unsigned octal (o), unsigned decimal + (u), or unsigned hexadecimal (x and X) notation. The + letters abcdef are used for x conversions; the letters + ABCDEF are used for X conversions. The precision, if + any, gives the minimum number of digits that must + appear; if the converted value requires fewer digits, + it is padded on the left with zeros. + + eE The double argument is rounded and converted in the style + [-]d.ddde+-dd where there is one digit before the decimal-point + character and the number of digits after it is equal + to the precision; if the precision is missing, it is + taken as 6; if the precision is zero, no decimal-point + character appears. An E conversion uses the letter + E (rather than e) to introduce the exponent. + The exponent always contains at least two digits; if + the value is zero, the exponent is 00. + + f The double argument is rounded and converted to decimal notation + in the style [-]ddd.ddd, where the number of digits after the + decimal-point character is equal to the precision specification. + If the precision is missing, it is taken as 6; if the precision + is explicitly zero, no decimal-point character appears. If a + decimal point appears, at least one digit appears before it. + + g The double argument is converted in style f or e (or + E for G conversions). The precision specifies the + number of significant digits. If the precision is + missing, 6 digits are given; if the precision is zero, + it is treated as 1. Style e is used if the exponent + from its conversion is less than -4 or greater than + or equal to the precision. Trailing zeros are removed + from the fractional part of the result; a decimal + point appears only if it is followed by at least one + digit. + + c The int argument is converted to an unsigned char, + and the resulting character is written. + + s The ``char *'' argument is expected to be a pointer to an array + of character type (pointer to a string). Characters + from the array are written up to (but not including) + a terminating NUL character; if a precision is + specified, no more than the number specified are + written. If a precision is given, no null character + need be present; if the precision is not specified, + or is greater than the size of the array, the array + must contain a terminating NUL character. + + % A `%' is written. No argument is converted. The complete + conversion specification is `%%'. + + In no case does a non-existent or small field width cause truncation of a + field; if the result of a conversion is wider than the field width, the + field is expanded to contain the conversion result. + + EXAMPLES + To print a date and time in the form `Sunday, July 3, 10:02', where + weekday and month are pointers to strings: + + #include <stdio.h> + fprintf(stdout, "%s, %s %d, %.2d:%.2d\n", + weekday, month, day, hour, min); + + To print pi to five decimal places: + + #include <math.h> + #include <stdio.h> + fprintf(stdout, "pi = %.5f\n", 4 * atan(1.0)); + + To allocate a 128 byte string and print into it: + + #include <stdio.h> + #include <stdlib.h> + #include <stdarg.h> + char *newfmt(const char *fmt, ...) + { + char *p; + va_list ap; + if ((p = malloc(128)) == NULL) + return (NULL); + va_start(ap, fmt); + (void) vsnprintf(p, 128, fmt, ap); + va_end(ap); + return (p); + } + + SEE ALSO + printf(1), scanf(3) + + STANDARDS + Turkey C Standardization and wimpy POSIX folks did not define + snprintf or vsnprintf(). + + BUGS + The conversion formats %D, %O, and %U are not standard and are provided + only for backward compatibility. The effect of padding the %p format + with zeros (either by the `0' flag or by specifying a precision), and the + benign effect (i.e., none) of the `#' flag on %n and %p conversions, as + well as other nonsensical combinations such as %Ld, are not standard; + such combinations should be avoided. + + The typedef names quad_t and u_quad_t are infelicitous. + +*/ + + +#include <sys/types.h> +#include <ctype.h> +#include <stdlib.h> +#include <stdio.h> +#if defined(HAVE_STRING_H) +# include <string.h> +#endif +#if defined(HAVE_STRINGS_H) +# include <strings.h> +#endif +#if defined(HAVE_ERRNO_H) +#include <errno.h> +#endif /* - * dopr(): poor man's version of doprintf + * For testing, define these values */ +#if 0 +#define HAVE_STDARG_H 1 +#define TEST 1 +#define HAVE_QUAD_T 1 +#endif + +/**** ENDINCLUDE ****/ + +/************************************************* + * KEEP THIS STRING - MODIFY AT THE END WITH YOUR REVISIONS + * i.e. - the LOCAL REVISIONS part is for your use + *************************************************/ + + + static char *const _id = "plp_snprintf V2000.08.18 Copyright Patrick Powell 1988-2000 " + "$Id: plp_snprintf.c,v 1.4 2005/04/14 20:05:19 papowell Exp $" + " LOCAL REVISIONS: renamed plp_snprintf to snprintf, conditionalized everything on HAVE_SNPRINTF"; + +/* varargs declarations: */ + +# undef HAVE_STDARGS /* let's hope that works everywhere (mj) */ +# undef VA_LOCAL_DECL +# undef VA_START +# undef VA_SHIFT +# undef VA_END + +#if defined(HAVE_STDARG_H) +# include <stdarg.h> +# define HAVE_STDARGS /* let's hope that works everywhere (mj) */ +# define VA_LOCAL_DECL va_list ap; +# define VA_START(f) va_start(ap, f) +# define VA_SHIFT(v,t) ; /* no-op for ANSI */ +# define VA_END va_end(ap) +#else +# if defined(HAVE_VARARGS_H) +# include <varargs.h> +# undef HAVE_STDARGS +# define VA_LOCAL_DECL va_list ap; +# define VA_START(f) va_start(ap) /* f is ignored! */ +# define VA_SHIFT(v,t) v = va_arg(ap,t) +# define VA_END va_end(ap) +# else + XX ** NO VARARGS ** XX +# endif +#endif -static char * plp_Errormsg ( int err ); -static void dopr( char *buffer, const char *format, va_list args ); -static void fmtstr( char *value, int ljust, int len, int zpad, int precision ); -static void fmtnum( long value, int base, int dosign, + union value { +#if defined(HAVE_QUAD_T) + quad_t qvalue; +#endif +#if defined(HAVE_LONG_LONG) + long long value; +#else + long value; +#endif + double dvalue; +}; + +#undef CVAL +#define CVAL(s) (*((unsigned char *)s)) +#define safestrlen(s) ((s)?strlen(s):0) + + + static char * plp_Errormsg ( int err, char *buffer ); + static void dopr( int visible_control, char **buffer, int *left, + const char *format, va_list args ); + static void fmtstr( int visible_control, char **buffer, int *left, + char *value, int ljust, int len, int zpad, int precision ); + static void fmtnum( char **buffer, int *left, + union value *value, int base, int dosign, + int ljust, int len, int zpad, int precision ); +#if defined(HAVE_QUAD_T) + static void fmtquad( char **buffer, int *left, + union value *value, int base, int dosign, int ljust, int len, int zpad, int precision ); -static void fmtdouble( int fmt, double value, +#endif + static void fmtdouble( char **bufer, int *left, + int fmt, double value, int ljust, int len, int zpad, int precision ); -static void dostr( char * ); -static char *output; -static void dopr_outch( int c ); -static char *end; -int visible_control = 1; - -/************************************************************** - * Original: - * Patrick Powell Tue Apr 11 09:48:21 PDT 1995 - * A bombproof version of doprnt (dopr) included. - * Sigh. This sort of thing is always nasty do deal with. Note that - * the version here does not include floating point... - * - * plp_snprintf() is used instead of sprintf() as it does limit checks - * for string length. This covers a nasty loophole. - * - * The other functions are there to prevent NULL pointers from - * causing nast effects. - **************************************************************/ - -int vsnprintf(char *str, size_t count, const char *fmt, va_list args) + static void dostr( char **buffer, int *left, char *str ); + static void dopr_outch( char **buffer, int *left, int c ); +/* VARARGS3 */ +#ifdef HAVE_STDARGS + int plp_vsnprintf(char *str, size_t count, const char *fmt, va_list args) +#else + int plp_vsnprintf(char *str, size_t count, const char *fmt, va_list args) +#endif + +{ + int left; + char *buffer; + if( (int)count < 0 ) count = 0; + left = count; + if( count == 0 ) str = 0; + buffer = str; + dopr( 1, &buffer, &left, fmt, args ); + /* fprintf(stderr,"str 0x%x, buffer 0x%x, count %d, left %d\n", + (int)str, (int)buffer, count, left ); */ + if( str && count > 0 ){ + if( left > 0 ){ + str[count-left] = 0; + } else { + str[count-1] = 0; + } + } + return(count - left); +} + +/* VARARGS3 */ +#ifdef HAVE_STDARGS + int plp_unsafe_vsnprintf(char *str, size_t count, const char *fmt, va_list args) +#else + int plp_unsafe_vsnprintf(char *str, size_t count, const char *fmt, va_list args) +#endif { - str[0] = 0; - end = str+count-1; - dopr( str, fmt, args ); - if( count>0 ){ - end[0] = 0; + int left; + char *buffer; + if( (int)count < 0 ) count = 0; + left = count; + if( count == 0 ) str = 0; + buffer = str; + dopr( 0, &buffer, &left, fmt, args ); + /* fprintf(stderr,"str 0x%x, buffer 0x%x, count %d, left %d\n", + (int)str, (int)buffer, count, left ); */ + if( str && count > 0 ){ + if( left > 0 ){ + str[count-left] = 0; + } else { + str[count-1] = 0; + } } - return(strlen(str)); + return(count - left); } /* VARARGS3 */ #ifdef HAVE_STDARGS -int snprintf (char *str,size_t count,const char *fmt,...) + int snprintf (char *str,size_t count,const char *fmt,...) #else -int snprintf (va_alist) va_dcl + int snprintf (va_alist) va_dcl #endif { #ifndef HAVE_STDARGS @@ -183,22 +619,48 @@ int snprintf (va_alist) va_dcl size_t count; char *fmt; #endif + int n = 0; VA_LOCAL_DECL VA_START (fmt); VA_SHIFT (str, char *); VA_SHIFT (count, size_t ); VA_SHIFT (fmt, char *); - (void) vsnprintf ( str, count, fmt, ap); + n = plp_vsnprintf ( str, count, fmt, ap); VA_END; - return( strlen( str ) ); + return( n ); } -static void dopr( char *buffer, const char *format, va_list args ) + +/* VARARGS3 */ +#ifdef HAVE_STDARGS + int plp_unsafe_snprintf (char *str,size_t count,const char *fmt,...) +#else + int plp_unsafe_snprintf (va_alist) va_dcl +#endif +{ +#ifndef HAVE_STDARGS + char *str; + size_t count; + char *fmt; +#endif + int n = 0; + VA_LOCAL_DECL + + VA_START (fmt); + VA_SHIFT (str, char *); + VA_SHIFT (count, size_t ); + VA_SHIFT (fmt, char *); + n = plp_unsafe_vsnprintf ( str, count, fmt, ap); + VA_END; + return( n ); +} + static void dopr( int visible_control, char **buffer, int *left, const char *format, va_list args ) { int ch; - long value; + union value value; int longflag = 0; + int quadflag = 0; char *strvalue; int ljust; int len; @@ -207,22 +669,30 @@ static void dopr( char *buffer, const char *format, va_list args ) int set_precision; double dval; int err = errno; + int base = 0; + int signed_val = 0; - output = buffer; while( (ch = *format++) ){ switch( ch ){ case '%': - ljust = len = zpad = 0; + longflag = quadflag = + ljust = len = zpad = base = signed_val = 0; precision = -1; set_precision = 0; - nextch: + nextch: ch = *format++; switch( ch ){ case 0: - dostr( "**end of format**" ); + dostr( buffer, left, "**end of format**" ); return; case '-': ljust = 1; goto nextch; case '.': set_precision = 1; precision = 0; goto nextch; - case '*': len = va_arg( args, int ); goto nextch; + case '*': + if( set_precision ){ + precision = va_arg( args, int ); + } else { + len = va_arg( args, int ); + } + goto nextch; case '0': /* set zero padding if len not set */ if(len==0 && set_precision == 0 ) zpad = '0'; case '1': case '2': case '3': @@ -234,76 +704,91 @@ static void dopr( char *buffer, const char *format, va_list args ) len = len*10 + ch - '0'; } goto nextch; - case 'l': longflag = 1; goto nextch; + case 'l': ++longflag; goto nextch; + case 'q': +#if !defined( HAVE_QUAD_T ) + dostr( buffer, left, "*no quad_t support *"); + return; +#endif + quadflag = 1; + goto nextch; case 'u': case 'U': - /*fmtnum(value,base,dosign,ljust,len, zpad, precision) */ - if( longflag ){ - value = va_arg( args, long ); - } else { - value = va_arg( args, int ); - } - fmtnum( value, 10,0, ljust, len, zpad, precision ); break; + if( base == 0 ){ base = 10; signed_val = 0; } case 'o': case 'O': - /*fmtnum(value,base,dosign,ljust,len, zpad, precision) */ - if( longflag ){ - value = va_arg( args, long ); - } else { - value = va_arg( args, int ); - } - fmtnum( value, 8,0, ljust, len, zpad, precision ); break; + if( base == 0 ){ base = 8; signed_val = 0; } case 'd': case 'D': - if( longflag ){ - value = va_arg( args, long ); - } else { - value = va_arg( args, int ); - } - fmtnum( value, 10,1, ljust, len, zpad, precision ); break; + if( base == 0 ){ base = 10; signed_val = 1; } case 'x': - if( longflag ){ - value = va_arg( args, long ); - } else { - value = va_arg( args, int ); - } - fmtnum( value, 16,0, ljust, len, zpad, precision ); break; + if( base == 0 ){ base = 16; signed_val = 0; } case 'X': - if( longflag ){ - value = va_arg( args, long ); + if( base == 0 ){ base = -16; signed_val = 0; } +#if defined( HAVE_QUAD_T ) + if( quadflag ){ + value.qvalue = va_arg( args, quad_t ); + fmtquad( buffer, left, &value,base,signed_val, ljust, len, zpad, precision ); + break; + } else +#endif + if( longflag > 1 ){ +#if defined(HAVE_LONG_LONG) + if( signed_val ){ + value.value = va_arg( args, long long ); + } else { + value.value = va_arg( args, unsigned long long ); + } +#else + if( signed_val ){ + value.value = va_arg( args, long ); + } else { + value.value = va_arg( args, unsigned long ); + } +#endif + } else if( longflag ){ + if( signed_val ){ + value.value = va_arg( args, long ); + } else { + value.value = va_arg( args, unsigned long ); + } } else { - value = va_arg( args, int ); + if( signed_val ){ + value.value = va_arg( args, int ); + } else { + value.value = va_arg( args, unsigned int ); + } } - fmtnum( value,-16,0, ljust, len, zpad, precision ); break; + fmtnum( buffer, left, &value,base,signed_val, ljust, len, zpad, precision ); break; case 's': strvalue = va_arg( args, char *); - fmtstr( strvalue,ljust,len, zpad, precision ); + fmtstr( visible_control, buffer, left, strvalue,ljust,len, zpad, precision ); break; case 'c': ch = va_arg( args, int ); { char b[2]; - int vsb = visible_control; b[0] = ch; b[1] = 0; - visible_control = 0; - fmtstr( b,ljust,len, zpad, precision ); - visible_control = vsb; + fmtstr( 0, buffer, left, b,ljust,len, zpad, precision ); } break; - case 'f': case 'g': + case 'f': case 'g': case 'e': dval = va_arg( args, double ); - fmtdouble( ch, dval,ljust,len, zpad, precision ); break; + fmtdouble( buffer, left, ch, dval,ljust,len, zpad, precision ); break; case 'm': - fmtstr( plp_Errormsg(err),ljust,len, zpad, precision ); break; - case '%': dopr_outch( ch ); continue; + { char shortbuffer[32]; + fmtstr( visible_control, buffer, left, + plp_Errormsg(err, shortbuffer),ljust,len, zpad, precision ); + } + break; + case '%': dopr_outch( buffer, left, ch ); continue; default: - dostr( "???????" ); + dostr( buffer, left, "???????" ); } longflag = 0; break; default: - dopr_outch( ch ); + dopr_outch( buffer, left, ch ); break; } } - *output = 0; } /* @@ -312,63 +797,69 @@ static void dopr( char *buffer, const char *format, va_list args ) * len = minimum length * precision = numbers of chars in string to use */ -static void -fmtstr( char *value, int ljust, int len, int zpad, int precision ) + static void + fmtstr( int visible_control, char **buffer, int *left, + char *value, int ljust, int len, int zpad, int precision ) { - int padlen, strlen, i, c; /* amount to pad */ + int padlen, strlenv, i, c; /* amount to pad */ if( value == 0 ){ value = "<NULL>"; } - if( precision > 0 ){ - strlen = precision; - } else { - /* cheap strlen so you do not have library call */ - for( strlen = 0; (c=value[strlen]); ++ strlen ){ - if( visible_control && iscntrl( c ) && !isspace( c ) ){ - ++strlen; - } + /* cheap strlen so you do not have library call */ + for( strlenv = i = 0; (c=CVAL(value+i)); ++i ){ + if( visible_control && iscntrl( c ) && c != '\t' && c != '\n' ){ + ++strlenv; } + ++strlenv; + } + if( precision > 0 && strlenv > precision ){ + strlenv = precision; } - padlen = len - strlen; + padlen = len - strlenv; if( padlen < 0 ) padlen = 0; if( ljust ) padlen = -padlen; while( padlen > 0 ) { - dopr_outch( ' ' ); + dopr_outch( buffer, left, ' ' ); --padlen; } /* output characters */ - for( i = 0; (c = value[i]); ++i ){ - if( visible_control && iscntrl( c ) && !isspace( c ) ){ - dopr_outch('^'); + for( i = 0; i < strlenv && (c = CVAL(value+i)); ++i ){ + if( visible_control && iscntrl( c ) && c != '\t' && c != '\n' ){ + dopr_outch(buffer, left, '^'); c = ('@' | (c & 0x1F)); } - dopr_outch(c); + dopr_outch(buffer, left, c); } while( padlen < 0 ) { - dopr_outch( ' ' ); + dopr_outch( buffer, left, ' ' ); ++padlen; } } -static void -fmtnum( long value, int base, int dosign, int ljust, + static void + fmtnum( char **buffer, int *left, + union value *value, int base, int dosign, int ljust, int len, int zpad, int precision ) { int signvalue = 0; +#if defined(HAVE_LONG_LONG) + unsigned long long uvalue; +#else unsigned long uvalue; - char convert[20]; +#endif + char convert[sizeof( union value) * 8 + 16]; int place = 0; int padlen = 0; /* amount to pad */ int caps = 0; - /* DEBUGP(("value 0x%x, base %d, dosign %d, ljust %d, len %d, zpad %d\n", - value, base, dosign, ljust, len, zpad )); */ - uvalue = value; + /* fprintf(stderr,"value 0x%x, base %d, dosign %d, ljust %d, len %d, zpad %d\n", + value, base, dosign, ljust, len, zpad );/ **/ + uvalue = value->value; if( dosign ){ - if( value < 0 ) { + if( value->value < 0 ) { signvalue = '-'; - uvalue = -value; + uvalue = -value->value; } } if( base < 0 ){ @@ -385,71 +876,148 @@ fmtnum( long value, int base, int dosign, int ljust, padlen = len - place; if( padlen < 0 ) padlen = 0; if( ljust ) padlen = -padlen; - /* DEBUGP(( "str '%s', place %d, sign %c, padlen %d\n", - convert,place,signvalue,padlen)); */ + /* fprintf( stderr, "str '%s', place %d, sign %c, padlen %d\n", + convert,place,signvalue,padlen); / **/ if( zpad && padlen > 0 ){ if( signvalue ){ - dopr_outch( signvalue ); + dopr_outch( buffer, left, signvalue ); --padlen; signvalue = 0; } while( padlen > 0 ){ - dopr_outch( zpad ); + dopr_outch( buffer, left, zpad ); --padlen; } } while( padlen > 0 ) { - dopr_outch( ' ' ); + dopr_outch( buffer, left, ' ' ); --padlen; } - if( signvalue ) dopr_outch( signvalue ); - while( place > 0 ) dopr_outch( convert[--place] ); + if( signvalue ) dopr_outch( buffer, left, signvalue ); + while( place > 0 ) dopr_outch( buffer, left, convert[--place] ); while( padlen < 0 ){ - dopr_outch( ' ' ); + dopr_outch( buffer, left, ' ' ); ++padlen; } } -static void -fmtdouble( int fmt, double value, int ljust, int len, int zpad, int precision ) +#if defined(HAVE_QUAD_T) + + static void + fmtquad( char **buffer, int *left, + union value *value, int base, int dosign, int ljust, + int len, int zpad, int precision ) { - char convert[128]; - char fmtstr[128]; - int l; + int signvalue = 0; + int place = 0; + int padlen = 0; /* amount to pad */ + int caps = 0; + int i, c; + union { + quad_t qvalue; + unsigned char qconvert[sizeof(quad_t)]; + } vvalue; + char convert[2*sizeof(quad_t)+1]; + + /* fprintf(stderr,"value 0x%x, base %d, dosign %d, ljust %d, len %d, zpad %d\n", + value, base, dosign, ljust, len, zpad );/ **/ + vvalue.qvalue = value->qvalue; + + if( base < 0 ){ + caps = 1; + } - if( len == 0 ) len = 10; - if( len > sizeof(convert) - 10 ){ - len = sizeof(convert) - 10; + for( i = 0; i < (int)sizeof(quad_t); ++i ){ + c = vvalue.qconvert[i]; + convert[2*i] = + (caps? "0123456789ABCDEF":"0123456789abcdef")[ (c >> 4) & 0xF]; + convert[2*i+1] = + (caps? "0123456789ABCDEF":"0123456789abcdef")[ c & 0xF]; } - if( precision > sizeof(convert) - 10 ){ - precision = sizeof(convert) - 10; + convert[2*i] = 0; + + place = strlen(convert); + padlen = len - place; + if( padlen < 0 ) padlen = 0; + if( ljust ) padlen = -padlen; + /* fprintf( stderr, "str '%s', place %d, sign %c, padlen %d\n", + convert,place,signvalue,padlen); / **/ + if( zpad && padlen > 0 ){ + if( signvalue ){ + dopr_outch( buffer, left, signvalue ); + --padlen; + signvalue = 0; + } + while( padlen > 0 ){ + dopr_outch( buffer, left, zpad ); + --padlen; + } } - if( precision > len ) precision = len; - strcpy( fmtstr, "%" ); - if( ljust ) strcat(fmtstr, "-" ); - if( len ){ - sprintf( fmtstr+strlen(fmtstr), "%d", len ); + while( padlen > 0 ) { + dopr_outch( buffer, left, ' ' ); + --padlen; } - if( precision > 0 ){ - sprintf( fmtstr+strlen(fmtstr), ".%d", precision ); + if( signvalue ) dopr_outch( buffer, left, signvalue ); + while( place > 0 ) dopr_outch( buffer, left, convert[--place] ); + while( padlen < 0 ){ + dopr_outch( buffer, left, ' ' ); + ++padlen; } - l = strlen( fmtstr ); - fmtstr[l] = fmt; - fmtstr[l+1] = 0; - sprintf( convert, fmtstr, value ); - dostr( convert ); } -static void dostr( char *str ) +#endif + + static void mystrcat(char *dest, char *src ) { - while(*str) dopr_outch(*str++); + if( dest && src ){ + dest += safestrlen(dest); + strcpy(dest,src); + } +} + + static void + fmtdouble( char **buffer, int *left, + int fmt, double value, int ljust, int len, int zpad, int precision ) +{ + char convert[sizeof( union value) * 8 + 512]; + char formatstr[128]; + + /* fprintf(stderr,"len %d, precision %d\n", len, precision ); */ + if( len > 255 ){ + len = 255; + } + if( precision > 255 ){ + precision = 255; + } + if( precision >= 0 && len > 0 && precision > len ) precision = len; + strcpy( formatstr, "%" ); /* 1 */ + if( ljust ) mystrcat(formatstr, "-" ); /* 1 */ + if( zpad ) mystrcat(formatstr, "0" ); /* 1 */ + if( len >= 0 ){ + sprintf( formatstr+strlen(formatstr), "%d", len ); /* 3 */ + } + if( precision >= 0 ){ + sprintf( formatstr+strlen(formatstr), ".%d", precision ); /* 3 */ + } + /* format string will be at most 10 chars long ... */ + sprintf( formatstr+strlen(formatstr), "%c", fmt ); + /* this is easier than trying to do the portable dtostr */ + /* fprintf(stderr,"format string '%s'\n", formatstr); */ + sprintf( convert, formatstr, value ); + dostr( buffer, left, convert ); +} + + static void dostr( char **buffer, int *left, char *str ) +{ + if(str)while(*str) dopr_outch( buffer, left, *str++ ); } -static void dopr_outch( int c ) + static void dopr_outch( char **buffer, int *left, int c ) { - if( end == 0 || output < end ){ - *output++ = c; + if( *left > 0 ){ + *(*buffer)++ = c; } + *left -= 1; } @@ -461,29 +1029,26 @@ static void dopr_outch( int c ) * Patrick Powell Tue Apr 11 08:05:05 PDT 1995 ****************************************************************************/ /****************************************************************************/ -#if !defined(HAVE_STRERROR) - -# if defined(HAVE_SYS_NERR) -# if !defined(HAVE_SYS_NERR_DEF) - extern int sys_nerr; -# endif -# define num_errors (sys_nerr) -# else -# define num_errors (-1) /* always use "errno=%d" */ -# endif +#if !defined(HAVE_STRERROR) +# undef num_errors # if defined(HAVE_SYS_ERRLIST) -# if !defined(HAVE_SYS_ERRLIST_DEF) +# if !defined(HAVE_DECL_SYS_ERRLIST) extern const char *const sys_errlist[]; # endif -# else -# undef num_errors -# define num_errors (-1) /* always use "errno=%d" */ +# if defined(HAVE_SYS_NERR) +# if !defined(HAVE_DECL_SYS_NERR) + extern int sys_nerr; +# endif +# define num_errors (sys_nerr) +# endif +# endif +# if !defined(num_errors) +# define num_errors (-1) /* always use "errno=%d" */ # endif - #endif -static char * plp_Errormsg ( int err ) + static char * plp_Errormsg ( int err, char *buffer /* int maxlen = 32 */) { char *cp; @@ -496,10 +1061,8 @@ static char * plp_Errormsg ( int err ) } else # endif { - static char msgbuf[32]; /* holds "errno=%d". */ - /* SAFE use of sprintf */ - (void) sprintf (msgbuf, "errno=%d", err); - cp = msgbuf; + (void) sprintf (buffer, "errno=%d", err); + cp = buffer; } #endif return (cp); @@ -507,23 +1070,47 @@ static char * plp_Errormsg ( int err ) #if defined(TEST) #include <stdio.h> -int main( void ) + int main( void ) { char buffer[128]; char *t; char *test1 = "01234"; + int n; errno = 1; - plp_snprintf( buffer, sizeof(buffer), (t="errno '%m'")); printf( "%s = '%s'\n", t, buffer ); - plp_snprintf( buffer, sizeof(buffer), (t = "%s"), test1 ); printf( "%s = '%s'\n", t, buffer ); - plp_snprintf( buffer, sizeof(buffer), (t = "%12s"), test1 ); printf( "%s = '%s'\n", t, buffer ); - plp_snprintf( buffer, sizeof(buffer), (t = "%-12s"), test1 ); printf( "%s = '%s'\n", t, buffer ); - plp_snprintf( buffer, sizeof(buffer), (t = "%12.2s"), test1 ); printf( "%s = '%s'\n", t, buffer ); - plp_snprintf( buffer, sizeof(buffer), (t = "%-12.2s"), test1 ); printf( "%s = '%s'\n", t, buffer ); - plp_snprintf( buffer, sizeof(buffer), (t = "%g"), 1.25 ); printf( "%s = '%s'\n", t, buffer ); - plp_snprintf( buffer, sizeof(buffer), (t = "%g"), 1.2345 ); printf( "%s = '%s'\n", t, buffer ); - plp_snprintf( buffer, sizeof(buffer), (t = "%12g"), 1.25 ); printf( "%s = '%s'\n", t, buffer ); - plp_snprintf( buffer, sizeof(buffer), (t = "%12.2g"), 1.25 ); printf( "%s = '%s'\n", t, buffer ); - plp_snprintf( buffer, sizeof(buffer), (t = "%0*d"), 6, 1 ); printf( "%s = '%s'\n", t, buffer ); + buffer[0] = 0; + n = snprintf( buffer, 0, (t="test")); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t="errno '%m'")); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%s"), test1 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%12s"), test1 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%-12s"), test1 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%12.2s"), test1 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%-12.2s"), test1 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%g"), 1.25 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%g"), 1.2345 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%12g"), 1.25 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%12.1g"), 1.25 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%12.2g"), 1.25 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%12.3g"), 1.25 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%0*d"), 6, 1 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); +#if defined(HAVE_LONG_LONG) + n = snprintf( buffer, sizeof(buffer), (t = "%llx"), 1, 2, 3, 4 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%llx"), (long long)1, (long long)2 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%qx"), 1, 2, 3, 4 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%qx"), (quad_t)1, (quad_t)2 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); +#endif + n = snprintf( buffer, sizeof(buffer), (t = "0%x, 0%x"), (char *)(0x01234567), (char *)0, 0, 0, 0); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "0%x, 0%x"), (char *)(0x01234567), (char *)0x89ABCDEF, 0, 0, 0); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "0%x, 0%x"), t, 0, 0, 0, 0); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%f"), 1.25 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%f"), 1.2345 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%12f"), 1.25 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%12.2f"), 1.25 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%f"), 1.0 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%.0f"), 1.0 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%0.0f"), 1.0 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%1.0f"), 1.0 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%1.5f"), 1.0 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); + n = snprintf( buffer, sizeof(buffer), (t = "%5.5f"), 1.0 ); printf( "[%d] %s = '%s'\n", n, t, buffer ); return(0); } #endif |