59 lines
981 B
C
59 lines
981 B
C
/* $Header$ */
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#include <stdio.h>
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#define PMODE 0666
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FILE *freopen(name,mode,fp)
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char *name , *mode;
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register FILE *fp;
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{
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char *malloc();
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int fd,
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flags = fp->_flags & ~(IO_WRITEMODE|IO_READMODE|IO_ERR|IO_EOF|IO_PERPRINTF);
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fflush(fp);
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close(fileno(fp));
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switch(*mode){
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case 'w':
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flags |= IO_WRITEMODE;
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fd = creat (name,PMODE);
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break;
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case 'a':
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flags |= IO_WRITEMODE;
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if (( fd = open(name, 1)) < 0 )
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fd = creat(name, PMODE);
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if (fd >= 0) lseek(fd,0L,2);
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break;
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case 'r':
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flags |= IO_READMODE;
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fd = open(name, 0);
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break;
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default:
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fd = -1;
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}
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if (fd < 0) {
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register int i;
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for (i = 0; i < _NFILES; i++) {
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if (fp == _io_table[i]) {
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_io_table[i] = 0;
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break;
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}
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}
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if (fp != &_stdin && fp != &_stdout && fp != &_stderr) free(fp);
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return NULL;
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}
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fp->_count = 0;
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if (fp->_buf && !(flags & IO_UNBUFF) && (flags & IO_WRITEMODE))
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fp->_count = BUFSIZ;
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fp->_fd = fd;
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fp->_flags = flags;
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return(fp);
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}
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