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/*
* Copyright (c) 2003-2010 Alexandre Ratchov <alex@caoua.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* - 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.
*
* 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
* OWNER 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.
*/
/*
* 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 "dbg.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) {
dbg_puts("str_new: NULL pointer argument\n");
dbg_panic();
}
cnt = str_len(val) + 1;
buf = mem_alloc(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) {
dbg_puts("str_delete: NULL pointer argument\n");
dbg_panic();
}
mem_free(s);
}
/*
* print the string to stderr; can be safely used even if the string
* is NULL
*/
void
str_dbg(char *s)
{
if (s == NULL) {
dbg_puts("<nullstring>");
} else {
dbg_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) {
dbg_puts("std_id: NULL pointer argument\n");
dbg_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;
}
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