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/*
* Copyright 2023, Vincent Douillet <vincent@vdouillet.fr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
char *
str_head(const char *str, char c)
{
char *occ, *result;
size_t head_len;
occ = strrchr(str, c);
if (!occ || (occ == str && *occ != c))
return NULL;
/* copy head to new buffer */
head_len = occ - str + 1;
result = malloc(sizeof(char) * head_len);
if (result == NULL)
return NULL;
if (strlcpy(result, str, head_len) < head_len) {
free(result);
return NULL;
}
return result;
}
char *
str_tail(const char *str, char c)
{
char *right, *result;
size_t right_len;
right = strrchr(str, c);
if (!right || (right == str && *right != c))
return NULL;
/* copy right part to new buffer */
right_len = strlen(right);
result = malloc(sizeof(char) * right_len);
if (result == NULL)
return NULL;
if (strlcpy(result, right + 1, right_len) >= right_len) {
free(result);
return NULL;
}
return result;
}
void
str_replace(char *str, char a, char b)
{
char *tmp;
tmp = str;
while (*tmp != '\0') {
if (*tmp == a)
*tmp = b;
tmp++;
}
}
size_t
str_concat(char **dst,...)
{
va_list str_list;
const char *str;
char *concat;
size_t cur_size, dst_size, w_size;
/* first compute required size */
dst_size = 0;
va_start(str_list, dst);
while ((str = va_arg(str_list, char *)) != NULL) {
dst_size += strlen(str);
}
va_end(str_list);
dst_size++;
/* alloc result string */
*dst = malloc(sizeof(char) * dst_size);
if (*dst == NULL)
return 0;
/* concatenate now */
concat = *dst;
concat[0] = '\0';
w_size = 0;
va_start(str_list, dst);
while ((str = va_arg(str_list, char *)) != NULL) {
cur_size = strlen(str);
if (strlcpy(concat, str, dst_size) >= dst_size) {
w_size = 0;
free(dst);
break;
}
w_size += cur_size;
concat += cur_size;
dst_size -= cur_size;
}
va_end(str_list);
return w_size;
}
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