[f40a309] | 1 | /*
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| 2 | =============================================================================
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| 3 | fopen.c -- open a stream file for the Buchla 700 C I/O Library
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| 4 | Version 4 -- 1987-06-30 -- D.N. Lynx Crowe
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| 5 | =============================================================================
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| 6 | */
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| 7 |
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[6262b5c] | 8 | #include "all.h"
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[f40a309] | 9 |
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[7258c6a] | 10 | extern int32_t lseek(int16_t fd, int32_t pos, int16_t how);
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[f40a309] | 11 |
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[e225e77] | 12 | extern int16_t close(int16_t fd);
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| 13 | extern int16_t open(int8_t *name, int16_t flag, int16_t mode);
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| 14 |
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[7258c6a] | 15 | FILE *_opener(int8_t *name, int8_t *mode, int16_t aflag)
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[f40a309] | 16 | {
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| 17 | register FILE *fp;
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[7258c6a] | 18 | register int16_t plusopt;
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[f40a309] | 19 |
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| 20 | fp = Cbuffs;
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| 21 |
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| 22 | while ( fp->_flags ) {
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| 23 |
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| 24 | if ( ++fp GE (Cbuffs + NSTREAMS))
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| 25 | return(NULL);
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| 26 | }
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| 27 |
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| 28 | plusopt = mode[1] EQ '+';
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| 29 |
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| 30 | switch (0x007F & *mode) {
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| 31 |
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| 32 | case 'r': /* read mode */
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[e225e77] | 33 | if ((fp->_unit = open(name, (plusopt ? O_RDWR : O_RDONLY), aflag)) EQ -1)
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[f40a309] | 34 | return(NULL);
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| 35 | break;
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| 36 |
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| 37 | case 'w': /* write mode */
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[e225e77] | 38 | if ((fp->_unit = open(name, (plusopt ? O_RDWR : O_WRONLY)|O_CREAT|O_TRUNC, aflag)) EQ -1)
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[f40a309] | 39 | return(NULL);
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| 40 |
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| 41 | break;
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| 42 |
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| 43 | case 'a': /* append mode */
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[e225e77] | 44 | if ((fp->_unit = open(name, (plusopt ? O_RDWR : O_WRONLY)|O_CREAT, aflag)) EQ -1)
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[f40a309] | 45 | return(NULL);
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| 46 |
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| 47 | if (lseek(fp->_unit, 0L, 2) < 0) {
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| 48 |
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| 49 | close(fp->_unit);
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| 50 | return(NULL); /* couldn't append */
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| 51 | }
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| 52 |
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| 53 | break;
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| 54 |
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| 55 | default:
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| 56 | errno = EINVAL;
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| 57 | return(NULL);
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| 58 | }
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| 59 |
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| 60 | fp->_flags = _BUSY;
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| 61 | fp->_buflen = BUFSIZ;
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| 62 | fp->_buff = 0;
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| 63 | fp->_bend = 0; /* nothing in buffer */
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| 64 | fp->_bp = 0;
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| 65 | return(fp);
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| 66 | }
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| 67 |
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| 68 | /* |
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| 69 |
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| 70 | */
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[7258c6a] | 71 |
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[f40a309] | 72 | FILE *fopen(int8_t *name, int8_t *mode)
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| 73 | {
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| 74 | return(_opener(name, mode, 0));
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| 75 | }
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[7258c6a] | 76 |
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[f40a309] | 77 | FILE *fopena(int8_t *name, int8_t *mode)
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| 78 | {
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| 79 | return(_opener(name, mode, 0));
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| 80 | }
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[7258c6a] | 81 |
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[f40a309] | 82 | FILE *fopenb(int8_t *name, int8_t *mode)
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| 83 | {
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| 84 | return(_opener(name, mode, O_RAW));
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[6262b5c] | 85 | }
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| 86 |
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