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authorJörg Frings-Fürst <debian@jff.email>2022-01-08 11:51:07 +0100
committerJörg Frings-Fürst <debian@jff.email>2022-01-08 11:51:07 +0100
commitbe8efac78d067c138ad8dda03df4336e73f94887 (patch)
tree5f5254a628ba0ef72065b93d949d1c985742ea8e /gnulib-m4/calloc.m4
parent7b65dbd4ebade81d504cfe5e681292a58ad1fdf0 (diff)
New upstream version 1.0upstream/1.0
Diffstat (limited to 'gnulib-m4/calloc.m4')
-rw-r--r--gnulib-m4/calloc.m483
1 files changed, 83 insertions, 0 deletions
diff --git a/gnulib-m4/calloc.m4 b/gnulib-m4/calloc.m4
new file mode 100644
index 0000000..c01520e
--- /dev/null
+++ b/gnulib-m4/calloc.m4
@@ -0,0 +1,83 @@
+# calloc.m4 serial 29
+
+# Copyright (C) 2004-2022 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# Written by Jim Meyering.
+
+# Determine whether calloc (N, S) returns non-NULL when N*S is zero,
+# and returns NULL when N*S overflows.
+# If so, define HAVE_CALLOC. Otherwise, define calloc to rpl_calloc
+# and arrange to use a calloc wrapper function that does work in that case.
+
+# _AC_FUNC_CALLOC_IF([IF-WORKS], [IF-NOT])
+# -------------------------------------
+# If calloc is compatible with GNU calloc, run IF-WORKS, otherwise, IF-NOT.
+AC_DEFUN([_AC_FUNC_CALLOC_IF],
+[
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CACHE_CHECK([whether calloc (0, n) and calloc (n, 0) return nonnull],
+ [ac_cv_func_calloc_0_nonnull],
+ [if test $cross_compiling != yes; then
+ ac_cv_func_calloc_0_nonnull=yes
+ AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [AC_INCLUDES_DEFAULT],
+ [[int result = 0;
+ char * volatile p = calloc (0, 0);
+ if (!p)
+ result |= 1;
+ free (p);
+ return result;
+ ]])],
+ [],
+ [ac_cv_func_calloc_0_nonnull=no])
+ else
+ case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu* | gnu*) ac_cv_func_calloc_0_nonnull="guessing yes" ;;
+ # Guess yes on musl systems.
+ *-musl*) ac_cv_func_calloc_0_nonnull="guessing yes" ;;
+ # Guess yes on native Windows.
+ mingw*) ac_cv_func_calloc_0_nonnull="guessing yes" ;;
+ # If we don't know, obey --enable-cross-guesses.
+ *) ac_cv_func_calloc_0_nonnull="$gl_cross_guess_normal" ;;
+ esac
+ fi
+ ])
+ AS_CASE([$ac_cv_func_calloc_0_nonnull], [*yes], [$1], [$2])
+])
+
+
+# gl_FUNC_CALLOC_GNU
+# ------------------
+# Replace calloc if it is not compatible with GNU libc.
+AC_DEFUN([gl_FUNC_CALLOC_GNU],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_REQUIRE([gl_FUNC_CALLOC_POSIX])
+ REPLACE_CALLOC_FOR_CALLOC_GNU="$REPLACE_CALLOC_FOR_CALLOC_POSIX"
+ if test $REPLACE_CALLOC_FOR_CALLOC_GNU = 0; then
+ _AC_FUNC_CALLOC_IF([], [REPLACE_CALLOC_FOR_CALLOC_GNU=1])
+ fi
+])# gl_FUNC_CALLOC_GNU
+
+# gl_FUNC_CALLOC_POSIX
+# --------------------
+# Test whether 'calloc' is POSIX compliant (sets errno to ENOMEM when it
+# fails, and doesn't mess up with ptrdiff_t or size_t overflow),
+# and replace calloc if it is not.
+AC_DEFUN([gl_FUNC_CALLOC_POSIX],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_REQUIRE([gl_FUNC_MALLOC_POSIX])
+ if test $REPLACE_MALLOC_FOR_MALLOC_POSIX = 1; then
+ REPLACE_CALLOC_FOR_CALLOC_POSIX=1
+ fi
+ dnl Although in theory we should also test for size_t overflow,
+ dnl in practice testing for ptrdiff_t overflow suffices
+ dnl since PTRDIFF_MAX <= SIZE_MAX on all known Gnulib porting targets.
+ dnl A separate size_t test would slow down 'configure'.
+])