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/*
* utils.c
* Miscellaneous utilities for string manipulation
*
* Copyright (c) 2013 Federico Mena Quintero
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include "utils.h"
#ifndef HAVE_STPCPY
/**
* Copy characters from one string into another
*
* @note: The strings should not overlap, as the behavior is undefined.
*
* @s1: The source string.
* @s2: The destination string.
*
* @return a pointer to the terminating `\0' character of @s1,
* or NULL if @s1 or @s2 is NULL.
*/
char *stpcpy(char * s1, const char * s2)
{
if (s1 == NULL || s2 == NULL)
return NULL;
strcpy(s1, s2);
return s1 + strlen(s2);
}
#endif
/**
* Concatenate strings into a newly allocated string
*
* @note: Specify NULL for the last string in the varargs list
*
* @str: The first string in the list
* @...: Subsequent strings. Use NULL for the last item.
*
* @return a newly allocated string, or NULL if @str is NULL. This will also
* return NULL and set errno to ENOMEM if memory is exhausted.
*/
char *string_concat(const char *str, ...)
{
size_t len;
va_list args;
char *s;
char *result;
char *dest;
if (!str)
return NULL;
/* Compute final length */
len = strlen(str) + 1; /* plus 1 for the null terminator */
va_start(args, str);
s = va_arg(args, char *);
while (s) {
len += strlen(s);
s = va_arg(args, char*);
}
va_end(args);
/* Concat each string */
result = malloc(len);
if (!result)
return NULL; /* errno remains set */
dest = result;
dest = stpcpy(dest, str);
va_start(args, str);
s = va_arg(args, char *);
while (s) {
dest = stpcpy(dest, s);
s = va_arg(args, char *);
}
va_end(args);
return result;
}
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