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/* wrapper/rvs.c -- general and machine specific functions for rvs.
system depends:<stdio.h> <stdlib.h> <string.h> <unistd.h> <errno.h> <error.h>
Copyright (C) 2009 Luke Shumaker
This file is part of rvs.
rvs is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your
option) any later version.
rvs 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with rvs; see the file COPYING.
If not, write to the Free Software Foundation,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <error.h>
#include "rvs.h"
void *
xmalloc (size_t size)
{
void *value = malloc (size);
if (value == NULL) {
perror(program_invocation_name);
exit(EXIT_FAILURE);
}
return value;
}
void *
xrealloc (void *ptr, size_t size)
{
void *value = realloc (ptr, size);
if (value == NULL) {
perror(program_invocation_name);
exit(EXIT_FAILURE);
}
return value;
}
void
xfree (void *ptr)
{
if (ptr!=NULL)
free (ptr);
}
void
xsystem (const char *command)
{
int stat=system(command);
if (stat!=0) {
if (stat==-1) {
fprintf(stderr,
"%s: unable to launch run command",
program_invocation_name);
exit(EXIT_FAILURE);
} else
exit(EXIT_FAILURE);
}
}
/* unistd.h */
int
xchdir (const char *filename)
{
int ret=chdir(filename);
if (ret != 0)
error(EXIT_FAILURE,errno,"%s/",filename);
return ret;
}
/* stdio.h */
FILE *
xfopen (const char *filename, const char *opentype)
{
FILE *file = fopen(filename,opentype);
/* fopen gives NULL on failure */
if ( file == NULL )
error(EXIT_FAILURE,errno,"%s",filename);
return file;
}
/* string funtions */
void
stradds(size_t *size, char **dest, char *str)
{
if (*size > ( strlen(*dest) + strlen(str) ))
strcat(*dest, str);
else {
*size = strlen(*dest) + strlen(str) + 1;
*dest = (char *) xrealloc (*dest, *size);
strcat(*dest, str);
}
}
char *
stralloc (const char *string)
{
char *copy = (char *)xmalloc(strlen(string)+1);
strcpy(copy,string);
return copy;
}
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