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util.c
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util.c
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#define _GNU_SOURCE
#include <ctype.h>
#include <string.h>
#include "util.h"
char *strtrim(char *str)
{
char *pch = str;
if(str == NULL || *str == '\0') {
/* string is empty, so we're done. */
return str;
}
while(isspace((unsigned char)*pch)) {
pch++;
}
if(pch != str) {
memmove(str, pch, (strlen(pch) + 1));
}
/* check if there wasn't anything but whitespace in the string. */
if(*str == '\0') {
return str;
}
pch = (str + (strlen(str) - 1));
while(isspace((unsigned char)*pch)) {
pch--;
}
*++pch = '\0';
return str;
}
char *strreplace(const char *str, const char *needle, const char *replace)
{
const char *p = NULL, *q = NULL;
char *newstr = NULL, *newp = NULL;
char *list[16];
int i, listsz = 0;
size_t needlesz = strlen(needle), replacesz = strlen(replace);
size_t newsz;
if(!str) {
return NULL;
}
p = str;
q = strstr(p, needle);
while(q) {
list[listsz++] = (char*)q;
p = q + needlesz;
q = strstr(p, needle);
}
/* no occurences of needle found */
if(!listsz) {
return strdup(str);
}
/* size of new string = size of old string + "number of occurences of needle"
* x "size difference between replace and needle" */
newsz = strlen(str) + 1 +
listsz * (replacesz - needlesz);
newstr = calloc(newsz, sizeof(char));
if(!newstr) {
return NULL;
}
p = str;
newp = newstr;
for(i = 0; i < listsz; i++) {
q = list[i];
if(q > p) {
/* add chars between this occurence and last occurence, if any */
memcpy(newp, p, (size_t)(q - p));
newp += q - p;
}
memcpy(newp, replace, replacesz);
newp += replacesz;
p = q + needlesz;
}
if(*p) {
/* add the rest of 'p' */
strcpy(newp, p);
}
return newstr;
}
/* vim: set ts=2 sw=2 noet: */