64 lines
1.1 KiB
C
Executable File
64 lines
1.1 KiB
C
Executable File
/*
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* fdopen - convert a (UNIX) file descriptor into a FILE pointer
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*/
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/* $Header$ */
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#include <stdlib.h>
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#include "../stdio/loc_incl.h"
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#include <stdio.h>
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FILE *
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fdopen(fd, mode)
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int fd;
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_CONST char *mode;
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{
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register int i;
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FILE *stream;
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int flags = 0;
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if (fd < 0) return (FILE *)NULL;
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for (i = 0; __iotab[i] != 0 ; i++)
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if (i >= FOPEN_MAX-1)
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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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break;
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case 'a':
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flags |= _IOAPPEND;
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case 'w':
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flags |= _IOWRITE | _IOWRITING;
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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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continue;
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case '+':
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flags |= _IOREAD | _IOWRITE;
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continue;
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/* The sequence may be followed by aditional characters */
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default:
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break;
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}
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break;
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}
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if ((stream = (FILE *) malloc(sizeof(FILE))) == NULL) {
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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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__iotab[i] = stream;
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return stream;
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}
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