kolibrios-gitea/programs/develop/libraries/libmpg123/stringbuf.c

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/*
stringbuf: mimicking a bit of C++ to more safely handle strings
copyright 2006-8 by the mpg123 project - free software under the terms of the LGPL 2.1
see COPYING and AUTHORS files in distribution or http://mpg123.org
initially written by Thomas Orgis
*/
#include "mpg123lib_intern.h"
#include "config.h"
#include "mpg123.h"
#include "compat.h"
#include <string.h>
#include "debug.h"
void attribute_align_arg mpg123_init_string(mpg123_string* sb)
{
sb->p = NULL;
sb->size = 0;
sb->fill = 0;
}
void attribute_align_arg mpg123_free_string(mpg123_string* sb)
{
if(sb->p != NULL) free(sb->p);
mpg123_init_string(sb);
}
int attribute_align_arg mpg123_grow_string(mpg123_string* sb, size_t new)
{
if(sb->size < new) return mpg123_resize_string(sb, new);
else return 1;
}
int attribute_align_arg mpg123_resize_string(mpg123_string* sb, size_t new)
{
debug3("resizing string pointer %p from %lu to %lu", (void*) sb->p, (unsigned long)sb->size, (unsigned long)new);
if(new == 0)
{
if(sb->size && sb->p != NULL) free(sb->p);
mpg123_init_string(sb);
return 1;
}
if(sb->size != new)
{
char* t;
debug("really!");
t = (char*) safe_realloc(sb->p, new*sizeof(char));
debug1("safe_realloc returned %p", (void*) t);
if(t != NULL)
{
sb->p = t;
sb->size = new;
return 1;
}
else return 0;
}
else return 1; /* success */
}
int attribute_align_arg mpg123_copy_string(mpg123_string* from, mpg123_string* to)
{
size_t fill;
char *text;
if(to == NULL) return -1;
debug2("called copy_string with %p -> %p", (void*)from, (void*)to);
if(from == NULL)
{
fill = 0;
text = NULL;
}
else
{
fill = from->fill;
text = from->p;
}
if(mpg123_resize_string(to, fill))
{
memcpy(to->p, text, fill);
to->fill = fill;
return 1;
}
else return 0;
}
int attribute_align_arg mpg123_add_string(mpg123_string* sb, const char* stuff)
{
debug1("adding %s", stuff);
return mpg123_add_substring(sb, stuff, 0, strlen(stuff));
}
int attribute_align_arg mpg123_add_substring(mpg123_string *sb, const char *stuff, size_t from, size_t count)
{
debug("adding a substring");
if(sb->fill) /* includes zero byte... */
{
if( (SIZE_MAX - sb->fill >= count) /* Avoid overflow. */
&& (sb->size >= sb->fill+count || mpg123_grow_string(sb, sb->fill+count)) )
{
memcpy(sb->p+sb->fill-1, stuff+from, count);
sb->fill += count;
sb->p[sb->fill-1] = 0; /* Terminate! */
}
else return 0;
}
else
{
if( count < SIZE_MAX && mpg123_grow_string(sb, count+1) )
{
memcpy(sb->p, stuff+from, count);
sb->fill = count+1;
sb->p[sb->fill-1] = 0; /* Terminate! */
}
else return 0;
}
return 1;
}
int attribute_align_arg mpg123_set_substring(mpg123_string* sb, const char* stuff, size_t from, size_t count)
{
sb->fill = 0;
return mpg123_add_substring(sb, stuff, from, count);
}
int attribute_align_arg mpg123_set_string(mpg123_string* sb, const char* stuff)
{
sb->fill = 0;
return mpg123_add_string(sb, stuff);
}