www.nico.schottelius.org/software/cinit/browse_source/cinit-0.0.7/old/read_file.c
Nico Schottelius 423ba10303 import cinit from unix.schottelius.org
Signed-off-by: Nico Schottelius <nico@ikn.schottelius.org>
2009-09-16 12:53:45 +02:00

100 lines
2 KiB
C

/*
* (c) 2005 Nico Schottelius (nico-linux at schottelius.org)
* run_svc
* part of cinit
*/
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdio.h>
#include "cinit.h"
/***********************************************************************
* read_file: return file content, each line a char*
*/
char **read_file(char *file)
{
int tmp;
int fd, argc;
char buf[BUFSIZE];
char *p, *sbuf = NULL;
char **nargv = NULL;
struct stat stbuf;
D_PRINTF("Lese Datei");
D_PRINTF(file);
if( !stat(file,&stbuf) ) {
fd = open(file,O_RDONLY);
if(fd == -1) {
LOG("params exists, but open params failed");
return NULL;
}
D_PRINTF("open ist ok");
argc = 0;
/* most likely one round */
while ( (tmp = read(fd,buf,BUFSIZE) ) != 0 ) {
if(tmp == -1) {
perror("read");
return NULL;
}
sbuf = realloc(sbuf,argc + tmp + 1);
strncpy(&sbuf[argc],buf,tmp);
argc += tmp;
}
close(fd);
}
sbuf[argc] = '\0';
/************** build string **************/
/* The idea is to reuse the allocated memory. We'll simply
* replace the \n with \0 and set a char* to it.
* We'll lose the last byte (the initial \0), but we
* don't care, as we die some seconds later with execv() */
argc = 0;
while( (p = strchr(sbuf,'\n')) ) {
nargv = realloc(nargv, sizeof(char *) * (argc + 1));
if(nargv == NULL) {
LOG("realloc failed");
return NULL;
}
nargv[argc] = sbuf;
*p = '\0';
sbuf = p+1; /* is ok, as behind the last \n is a \0 */
argc++;
}
/************ close argv list **************/
nargv = realloc(nargv, sizeof(char *) * (argc + 1));
if(nargv == NULL) {
LOG("realloc failed");
return NULL;
}
nargv[argc] = NULL; /* terminate argv list */
return nargv;
}