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/*
* Auto-sizing memory containers
* Copyright Jan Engelhardt, 2002-2011
*
* This file is part of libHX. libHX is free software; you can
* redistribute it and/or modify it under the terms of the GNU Lesser
* General Public License as published by the Free Software Foundation;
* either version 2.1 or (at your option) any later version.
*/
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libHX/string.h>
#include "internal.h"
static __inline__ size_t __HXmc_request(size_t len)
{
/* The container, data portion, and a trailing \0 */
return sizeof(struct memcont) + len + 1;
}
static __inline__ void HXmc_check(const struct memcont *c)
{
if (c->id != HXMC_IDENT)
fprintf(stderr, "libHX-mc error: not a hxmc object!\n");
}
static __inline__ struct memcont *HXmc_base(const hxmc_t *p)
{
return containerof(p, struct memcont, data);
}
EXPORT_SYMBOL hxmc_t *HXmc_strinit(const char *s)
{
hxmc_t *t = NULL;
size_t z = strlen(s);
if (z < 23 && HXmc_memcpy(&t, NULL, 23) == NULL)
return NULL;
return HXmc_memcpy(&t, s, z);
}
EXPORT_SYMBOL hxmc_t *HXmc_meminit(const void *ptr, size_t len)
{
hxmc_t *t = NULL;
return HXmc_memcpy(&t, ptr, len);
}
EXPORT_SYMBOL hxmc_t *HXmc_strcpy(hxmc_t **vp, const char *s)
{
if (s == NULL) {
HXmc_free(*vp);
*vp = NULL;
return NULL;
}
return HXmc_memcpy(vp, s, strlen(s));
}
EXPORT_SYMBOL hxmc_t *HXmc_memcpy(hxmc_t **vp, const void *ptr, size_t len)
{
struct memcont *ctx;
if (*vp != NULL) {
ctx = HXmc_base(*vp);
HXmc_check(ctx);
if (ctx->alloc < len) {
ctx = realloc(ctx, __HXmc_request(len));
if (ctx == NULL)
return NULL;
ctx->alloc = len;
}
} else {
ctx = malloc(__HXmc_request(len));
if (ctx == NULL)
return NULL;
ctx->id = HXMC_IDENT;
ctx->alloc = len;
}
if (ptr == NULL) {
ctx->length = 0;
ctx->data[0] = '\0';
return *vp = ctx->data;
}
memcpy(ctx->data, ptr, ctx->length = len);
ctx->data[len] = '\0';
return *vp = ctx->data;
}
EXPORT_SYMBOL size_t HXmc_length(const hxmc_t *vp)
{
const struct memcont *ctx;
if (vp == NULL)
return 0;
ctx = HXmc_base(vp);
HXmc_check(ctx);
return ctx->length;
}
EXPORT_SYMBOL hxmc_t *HXmc_setlen(hxmc_t **vp, size_t len)
{
struct memcont *ctx;
if (HXmc_trunc(vp, len) == NULL)
return NULL;
ctx = HXmc_base(*vp);
ctx->length = len;
return *vp;
}
EXPORT_SYMBOL hxmc_t *HXmc_trunc(hxmc_t **vp, size_t len)
{
struct memcont *ctx = HXmc_base(*vp);
HXmc_check(ctx);
if (len > ctx->alloc) {
ctx = realloc(ctx, __HXmc_request(len));
if (ctx == NULL)
return NULL;
ctx->alloc = len;
} else {
ctx->data[len] = '\0';
ctx->length = len;
}
return *vp = ctx->data;
}
EXPORT_SYMBOL hxmc_t *HXmc_strcat(hxmc_t **vp, const char *s)
{
if (s == NULL)
return *vp;
return HXmc_memcat(vp, s, strlen(s));
}
EXPORT_SYMBOL hxmc_t *HXmc_memcat(hxmc_t **vp, const void *ptr, size_t len)
{
struct memcont *ctx = HXmc_base(*vp);
size_t nl = ctx->length + len;
HXmc_check(ctx);
if (nl > ctx->alloc) {
ctx = realloc(ctx, __HXmc_request(nl));
if (ctx == NULL)
return NULL;
ctx->alloc = nl;
}
if (ptr == NULL)
return *vp = ctx->data;
memcpy(ctx->data + ctx->length, ptr, len);
ctx->length = nl;
ctx->data[nl] = '\0';
return *vp = ctx->data;
}
EXPORT_SYMBOL hxmc_t *HXmc_strpcat(hxmc_t **vp, const char *s)
{
/* Prepend string @s to @*vp */
if (s == NULL)
return *vp;
return HXmc_memins(vp, 0, s, strlen(s));
}
EXPORT_SYMBOL hxmc_t *HXmc_mempcat(hxmc_t **vp, const void *ptr, size_t len)
{
/* Prepend memory @ptr (of length @len) to @*vp */
return HXmc_memins(vp, 0, ptr, len);
}
EXPORT_SYMBOL hxmc_t *HXmc_strins(hxmc_t **vp, size_t pos, const char *s)
{
if (s == NULL)
return *vp;
return HXmc_memins(vp, pos, s, strlen(s));
}
/*
* We naturally do not support negative positions like some
* scripting languages do, hence @pos is unsigned.
*/
EXPORT_SYMBOL hxmc_t *HXmc_memins(hxmc_t **vp, size_t pos, const void *ptr,
size_t len)
{
struct memcont *ctx = HXmc_base(*vp);
size_t nl = ctx->length + len;
HXmc_check(ctx);
if (ctx->alloc < nl) {
ctx = realloc(ctx, __HXmc_request(nl));
if (ctx == NULL)
return NULL;
ctx->alloc = nl;
}
if (ptr == NULL)
return *vp = ctx->data;
memmove(ctx->data + pos + len, ctx->data + pos, ctx->length - pos);
memcpy(ctx->data + pos, ptr, len);
ctx->length += len;
ctx->data[ctx->length] = '\0';
return *vp = ctx->data;
}
EXPORT_SYMBOL hxmc_t *HXmc_memdel(hxmc_t *vp, size_t pos, size_t len)
{
struct memcont *ctx = HXmc_base(vp);
HXmc_check(ctx);
if (pos + len > ctx->length)
len = ctx->length - pos;
memmove(ctx->data + pos, ctx->data + pos + len,
ctx->length - pos - len);
ctx->length -= len;
ctx->data[ctx->length] = '\0';
return ctx->data;
}
EXPORT_SYMBOL void HXmc_free(hxmc_t *vp)
{
struct memcont *ctx;
if (vp == NULL)
return;
ctx = HXmc_base(vp);
HXmc_check(ctx);
free(ctx);
}
EXPORT_SYMBOL void HXmc_zvecfree(hxmc_t **args)
{
hxmc_t **travp;
for (travp = args; *travp != NULL; ++travp)
HXmc_free(*travp);
free(args);
}
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