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