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/*
* Copyright (c) 2003-2010 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* simple string manupulation functions. A NULL pointer is considered
* as a "non-sense" string, and cannot be used with str_new() and
* str_delete(). Non-sense strings cannot be compared and have no
* length
*/
#include <string.h>
#include "utils.h"
#include "str.h"
/*
* allocate a new string and copy the string from the given argument
* into the allocated buffer the argument cannot be NULL.
*/
char *
str_new(char *val)
{
unsigned cnt;
char *s, *buf;
if (val == NULL) {
log_puts("str_new: NULL pointer argument\n");
panic();
}
cnt = str_len(val) + 1;
buf = xmalloc(cnt, "str");
for (s = buf; cnt > 0; cnt--) {
*s++ = *val++;
}
return buf;
}
/*
* free a string allocated with str_new() can't be used on NULL
* pointer
*/
void
str_delete(char *s)
{
if (s == NULL) {
log_puts("str_delete: NULL pointer argument\n");
panic();
}
xfree(s);
}
/*
* print the string to stderr; can be safely used even if the string
* is NULL
*/
void
str_log(char *s)
{
if (s == NULL) {
log_puts("<nullstring>");
} else {
log_puts(s);
}
}
/*
* return 1 if the two strings are identical and 0 otherwise. Two
* zero-length strings are considered identical.
*/
unsigned
str_eq(char *s1, char *s2)
{
if (s1 == NULL || s2 == NULL) {
log_puts("std_id: NULL pointer argument\n");
panic();
}
for (;;) {
if (*s1 == '\0' && *s2 == '\0') {
return 1;
} else if (*s1 == '\0' || *s2 == '\0' || *s1 != *s2) {
return 0;
}
s1++;
s2++;
}
}
/*
* return the length of the given string
*/
unsigned
str_len(char *s)
{
unsigned n;
for (n = 0; *s; s++) {
n++;
}
return n;
}
/*
* concatenate two strings.
*/
char *
str_cat(char *s1, char *s2)
{
size_t n1, n2;
char *buf;
n1 = str_len(s1);
n2 = str_len(s2);
buf = xmalloc(n1 + n2 + 1, "str");
memcpy(buf, s1, n1);
memcpy(buf + n1, s2, n2);
buf[n1 + n2] = 0;
return buf;
}
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