79 lines
1.3 KiB
C
79 lines
1.3 KiB
C
/*
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* fopen.c - open a stream
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*/
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/* $Header$ */
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/file.h>
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#include "loc_incl.h"
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#define PMODE 0666
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int open(const char *path, int flags, int mode);
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int close(int d);
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FILE *
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fopen(const char *name, const char *mode)
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{
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register int i;
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int rwmode = 0, rwflags = 0;
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FILE *stream;
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int fd, flags = 0;
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for (i = 0; _iotable[i] != 0 ; i++)
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if ( i >= FOPEN_MAX )
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return (FILE *)NULL;
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switch(*mode++) {
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case 'r':
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flags |= _IOREAD | _IOREADING;
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rwmode = O_RDONLY;
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break;
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case 'w':
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flags |= _IOWRITE | _IOWRITING;
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rwmode = O_WRONLY;
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rwflags = O_CREAT | O_TRUNC;
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break;
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case 'a':
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flags |= _IOWRITE | _IOWRITING;
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rwmode = O_WRONLY;
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rwflags |= O_APPEND | O_CREAT;
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break;
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default:
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return (FILE *)NULL;
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}
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while (*mode) {
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switch(*mode++) {
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case 'b':
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break;
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case '+':
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rwmode = O_RDWR;
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flags |= _IOREAD | _IOWRITE;
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break;
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default:
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return (FILE *)NULL;
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}
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}
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fd = open(name, rwmode | rwflags, PMODE);
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if (fd < 0) return (FILE *)NULL;
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if (( stream = (FILE *) malloc(sizeof(FILE))) == NULL ) {
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close(fd);
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return (FILE *)NULL;
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}
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if ((flags & _IOREAD) && (flags & _IOWRITE))
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flags &= ~(_IOREADING | _IOWRITING);
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stream->_count = 0;
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stream->_fd = fd;
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stream->_flags = flags;
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stream->_buf = NULL;
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_iotable[i] = stream;
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return stream;
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}
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