134 lines
2.4 KiB
C
134 lines
2.4 KiB
C
#include "fileutil.h"
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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int __fp_open(FILE *fp, int fd, bool use_buffering)
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{
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/* We initialize fdpos to 0 even in append mode (7.19.3§1) */
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fp->fd = fd;
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fp->fdpos = 0;
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/* We assume all files in the filesystem are non-interactive in order
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to conform to (7.19.5.3§7)
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TODO: Vhex might want something more elaborate here */
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if(use_buffering && setvbuf(fp, NULL, _IOFBF, BUFSIZ))
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return -1;
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return 0;
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}
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void __fp_close(FILE *fp, bool free_fp)
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{
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if(!fp)
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return;
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if(fp->fd >= 0) {
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fflush(fp);
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close(fp->fd);
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}
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if(fp->bufowned)
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free(fp->buf);
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if(free_fp)
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free(fp);
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}
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void __fp_buffer_mode_read(FILE *fp)
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{
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if(fp->bufmode != _IONBF && fp->bufdir == __FILE_BUF_WRITE &&
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fp->bufpos > 0)
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fflush(fp);
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fp->bufdir = __FILE_BUF_READ;
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}
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void __fp_buffer_mode_write(FILE *fp)
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{
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if(fp->bufmode != _IONBF && fp->bufdir == __FILE_BUF_READ &&
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fp->bufpos < fp->bufread)
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fflush(fp);
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fp->bufdir = __FILE_BUF_WRITE;
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}
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ssize_t __fp_read(FILE *fp, void *data, size_t size)
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{
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size_t read_ = 0;
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while(read_ < size) {
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ssize_t rc = read(fp->fd, data + read_, size - read_);
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if(rc < 0) {
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fp->error = 1;
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return EOF;
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}
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if(rc == 0) {
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fp->eof = 1;
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break;
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}
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fp->fdpos += rc;
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read_ += rc;
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}
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return read_;
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}
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ssize_t __fp_write(FILE *fp, void const *data, size_t size)
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{
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size_t written = 0;
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while(written < size) {
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ssize_t rc = write(fp->fd, data + written, size - written);
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if(rc < 0) {
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fp->error = 1;
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return EOF;
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}
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if(rc == 0)
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break;
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fp->fdpos += rc;
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written += rc;
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}
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return written;
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}
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int __fp_parse_mode(char const *mode, FILE *fp)
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{
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int base = 0;
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bool binary = false;
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bool update = false;
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for(int i = 0; mode[i]; i++) {
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if(mode[i] == 'r' || mode[i] == 'w' || mode[i] == 'a') {
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if(base) goto err;
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base = mode[i];
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}
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else if(mode[i] == 'b')
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binary = true;
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else if(mode[i] == '+')
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update = true;
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}
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if(!base) goto err;
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if(fp) {
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fp->readable = (base == 'r' || update);
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fp->writable = (base == 'w' || base == 'a' || update);
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fp->append = (base == 'a');
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fp->text = !binary;
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}
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if(base == 'r')
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return (update ? O_RDWR : O_RDONLY);
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if(base == 'w')
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return (update ? O_RDWR : O_WRONLY) | O_CREAT | O_TRUNC;
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if(base == 'a')
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return (update ? O_RDWR : O_WRONLY) | O_CREAT;
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/* Fallthrough */
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err:
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errno = EINVAL;
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return -1;
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}
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