zyxel-revert/filedata.c

76 lines
1.4 KiB
C
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2007-04-29 19:08:12 +02:00
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "filedata.h"
struct filedata * get_filedata(const char *filename)
{
int fd = open(filename, O_RDONLY);
if (fd < 0) {
perror("get_filedata(): open()");
return NULL;
}
struct stat filestat;
if (fstat(fd, &filestat) < 0) {
perror("get_filedata(): fstat()");
close(fd);
return NULL;
}
struct filedata *filedata = malloc(sizeof(struct filedata) + filestat.st_size);
if (filedata == NULL) {
perror("get_filedata(): malloc()");
close(fd);
return NULL;
}
filedata->size = filestat.st_size;
int readsize = read(fd, filedata->data, filedata->size);
if (readsize != filedata->size) {
perror("get_filedata(): read()");
free(filedata);
close(fd);
return NULL;
}
close(fd);
return filedata;
}
struct filedata * alloc_filedata(int size)
{
struct filedata *retval = malloc(sizeof(struct filedata) + size);
if (retval == NULL) {
perror("alloc_filedata(): malloc()");
return NULL;
}
retval->size = size;
return retval;
}
int put_filedata(const char *filename, struct filedata *filedata)
{
int fd = open(filename, O_RDWR | O_CREAT | O_TRUNC, 0644);
if (fd < 0) {
perror("put_filedata(): open()");
return -1;
}
int writesize = write(fd, filedata->data, filedata->size);
if (writesize != filedata->size) {
perror("put_filedata(): write()");
close(fd);
return -1;
}
close(fd);
return 0;
}