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#include "string.h"
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#ifndef HAVE_STRDUP
char *strdup(const char *s) {
if (NULL == s) {
return NULL;
}
size_t len = strlen(s);
char *buf = malloc(len+1);
if (buf) {
memcpy(buf, s, len + 1);
}
return buf;
}
#endif
size_t stranjoin_r(
char *restrict buf, size_t buflen, char sep, const char *restrict a[],
size_t nmemb) {
size_t len = 0;
if (NULL != buf && 0 < buflen) {
/* clear buf string */
*buf = '\0';
}
for (size_t i = 0; i < nmemb; ++i) {
if (0 < len) {
/* add separator */
if (NULL != buf && len < buflen) {
*(buf+len) = sep;
}
++len;
}
if (NULL != buf) {
/* append element */
strncpy(buf+len, a[i], (buflen - len));
}
len += strlen(a[i]);
}
return len;
}
char *stranjoin(char sep, const char *a[], size_t nmemb) {
/* determine length of result string */
size_t len = stranjoin_r(NULL, 0, sep, a, nmemb);
/* allocate destination buffer */
char *dest = malloc(len+1);
if (NULL != dest) {
(void)stranjoin_r(dest, len+1, sep, a, nmemb);
}
return dest;
}
size_t _vstrjoin_r(char *restrict buf, size_t buflen, char sep, va_list ap) {
const char *s;
size_t len = 0;
if (NULL != buf && 0 < buflen) {
/* clear buf string */
*buf = '\0';
}
while (NULL != (s = va_arg(ap, const char *restrict))) {
if (0 < len) {
/* add separator */
if (NULL != buf && len < buflen) {
*(buf+len) = sep;
}
++len;
}
if (NULL != buf) {
/* append element */
strncpy(buf+len, s, (buflen - len));
}
len += strlen(s);
}
return len;
}
size_t _strjoin_r(
char *restrict buf, size_t buflen, char sep, /* const char *restrict */...) {
va_list ap;
va_start(ap, sep);
size_t len = _vstrjoin_r(buf, buflen, sep, ap);
va_end(ap);
return len;
}
char *_strjoin(char sep, /* const char *restrict */...) {
va_list ap;
/* determine length of result string */
va_start(ap, sep);
size_t len = _vstrjoin_r(NULL, 0, sep, ap);
va_end(ap);
/* allocate destination buffer */
char *dest = malloc(len+1);
if (NULL != dest) {
(void)_vstrjoin_r(dest, len+1, sep, ap);
}
return dest;
}
size_t strsplit(const char *restrict in, const char *restrict sep, void *buf) {
size_t i = 0;
char **arr = buf;
if (0 == strlen(in)) {
/* special case: empty string */
if (arr) arr[0] = NULL;
return sizeof(char *);
}
char *tok, *saveptr, *tmp = strdup(in);
tok = strtok_r(tmp, sep, &saveptr);
do {
if (arr) {
arr[i] = (char *)(tok - tmp); /* save char offset */
}
i++;
} while ((tok = strtok_r(NULL, sep, &saveptr)));
size_t strtokoffset = ((i+1)*sizeof(*arr)),
strtoklen = strlen(in) + 1;
if (arr) {
/* update array pointers */
for (int j = 0; j < i; j++) {
arr[j] = (char *)((size_t)buf + strtokoffset + (size_t)arr[j]);
}
arr[i] = NULL; /* NULL termination */
/* copy tokenized string from tmp to the back of buf */
(void)memcpy(buf + strtokoffset, tmp, strtoklen);
}
free(tmp);
return (strtoklen + strtokoffset);
}
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