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86 lines
1.7 KiB
C
86 lines
1.7 KiB
C
/*
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* _fopen.c
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*
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* Ullrich von bassewitz, 17.06.1997
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*/
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#include <fcntl.h>
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#include <errno.h>
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#include "_file.h"
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static unsigned char amode_to_bmode (const char* mode)
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/* Convert ASCII mode (like for fopen) to binary mode (for open) */
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{
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unsigned char binmode;
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switch (*mode++) {
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case 'w':
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binmode = O_WRONLY | O_CREAT | O_TRUNC;
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break;
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case 'r':
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binmode = O_RDONLY;
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break;
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case 'a':
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binmode = O_WRONLY | O_APPEND;
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break;
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default:
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return 0; /* invalid char */
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}
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while (1) {
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switch (*mode++) {
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case '+':
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/* always to r/w in addition to anything already set */
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binmode |= O_RDWR;
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break;
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case 'b':
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/* currently ignored */
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break;
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case '\0':
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/* end of mode string reached */
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return binmode;
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default:
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/* invalid char in mode string */
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return 0;
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}
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}
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}
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FILE* _fopen (const char* name, const char* mode, FILE* f)
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/* Open the specified file and fill the descriptor values into f */
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{
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int fd;
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unsigned char binmode;
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/* Convert ASCII mode to binary mode */
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if ((binmode = amode_to_bmode (mode)) == 0) {
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/* Invalid mode */
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_errno = EINVAL;
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return 0;
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}
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/* Open the file */
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fd = open (name, binmode);
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if (fd == -1) {
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/* Error - _oserror is set */
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return 0;
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}
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/* Remember fd, mark the file as opened */
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f->f_fd = fd;
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f->f_flags = _FOPEN;
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/* Return the file descriptor */
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return f;
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}
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