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