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77 lines
1.5 KiB
C
77 lines
1.5 KiB
C
/* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */
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#include <crtdll/sys/types.h>
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#include <crtdll/stdio.h>
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#include <crtdll/io.h>
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#include <crtdll/fcntl.h>
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#include <crtdll/internal/file.h>
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//might change fopen(file,mode) -> fsopen(file,mode,_SH_DENYNO);
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FILE * __alloc_file(void);
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FILE* fopen(const char *file, const char *mode)
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{
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FILE *f;
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int fd, rw, oflags = 0;
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char tbchar;
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if (file == 0)
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return 0;
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if (mode == 0)
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return 0;
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f = __alloc_file();
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if (f == NULL)
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return NULL;
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rw = (mode[1] == '+') || (mode[1] && (mode[2] == '+'));
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switch (*mode)
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{
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case 'a':
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oflags = O_CREAT | (rw ? O_RDWR : O_WRONLY);
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break;
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case 'r':
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oflags = rw ? O_RDWR : O_RDONLY;
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break;
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case 'w':
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oflags = O_TRUNC | O_CREAT | (rw ? O_RDWR : O_WRONLY);
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break;
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default:
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return (NULL);
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}
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if (mode[1] == '+')
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tbchar = mode[2];
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else
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tbchar = mode[1];
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if (tbchar == 't')
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oflags |= O_TEXT;
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else if (tbchar == 'b')
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oflags |= O_BINARY;
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else
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oflags |= (_fmode & (O_TEXT|O_BINARY));
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fd = _open(file, oflags, 0);
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if (fd < 0)
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return NULL;
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// ms crtdll ensures that writes will end up at the end of file in append mode
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// we just move the file pointer to the end of file initially
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if (*mode == 'a')
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lseek(fd, 0, SEEK_END);
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f->_cnt = 0;
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f->_file = fd;
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f->_bufsiz = 0;
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if (rw)
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f->_flag = _IOREAD | _IOWRT;
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else if (*mode == 'r')
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f->_flag = _IOREAD;
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else
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f->_flag = _IOWRT;
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f->_base = f->_ptr = NULL;
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return f;
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}
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