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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8 | #include "stdio.h"
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9 | #include "fcntl.h"
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10 | #include "errno.h"
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11 | #include "stddefs.h"
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12 |
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13 | extern int32_t lseek(int16_t fd, int32_t pos, int16_t how);
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14 |
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15 | extern int16_t close(int16_t fd);
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16 | extern int16_t open(int8_t *name, int16_t flag, int16_t mode);
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17 |
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18 | FILE *_opener(int8_t *name, int8_t *mode, int16_t aflag)
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19 | {
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20 | register FILE *fp;
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21 | register int16_t plusopt;
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22 |
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23 | fp = Cbuffs;
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24 |
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25 | while ( fp->_flags ) {
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26 |
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27 | if ( ++fp GE (Cbuffs + NSTREAMS))
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28 | return(NULL);
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29 | }
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30 |
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31 | plusopt = mode[1] EQ '+';
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32 |
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33 | switch (0x007F & *mode) {
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34 |
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35 | case 'r': /* read mode */
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36 | if ((fp->_unit = open(name, (plusopt ? O_RDWR : O_RDONLY), aflag)) EQ -1)
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37 | return(NULL);
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38 | break;
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39 |
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40 | case 'w': /* write mode */
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41 | if ((fp->_unit = open(name, (plusopt ? O_RDWR : O_WRONLY)|O_CREAT|O_TRUNC, aflag)) EQ -1)
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42 | return(NULL);
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43 |
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44 | break;
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45 |
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46 | case 'a': /* append mode */
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47 | if ((fp->_unit = open(name, (plusopt ? O_RDWR : O_WRONLY)|O_CREAT, aflag)) EQ -1)
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48 | return(NULL);
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49 |
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50 | if (lseek(fp->_unit, 0L, 2) < 0) {
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51 |
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52 | close(fp->_unit);
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53 | return(NULL); /* couldn't append */
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54 | }
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55 |
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56 | break;
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57 |
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58 | default:
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59 | errno = EINVAL;
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60 | return(NULL);
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61 | }
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62 |
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63 | fp->_flags = _BUSY;
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64 | fp->_buflen = BUFSIZ;
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65 | fp->_buff = 0;
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66 | fp->_bend = 0; /* nothing in buffer */
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67 | fp->_bp = 0;
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68 | return(fp);
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69 | }
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70 |
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71 | /* |
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72 |
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73 | */
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74 |
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75 | FILE *fopen(int8_t *name, int8_t *mode)
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76 | {
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77 | return(_opener(name, mode, 0));
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78 | }
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79 |
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80 | FILE *fopena(int8_t *name, int8_t *mode)
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81 | {
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82 | return(_opener(name, mode, 0));
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83 | }
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84 |
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85 | FILE *fopenb(int8_t *name, int8_t *mode)
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86 | {
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87 | return(_opener(name, mode, O_RAW));
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88 | }
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