[f40a309] | 1 | /*
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| 2 | =============================================================================
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| 3 | open.c -- open a file for the Buchla 700 C I/O library functions
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| 4 | Version 11 -- 1988-01-31 -- 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 "biosdefs.h"
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| 9 | #include "errno.h"
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| 10 | #include "fcntl.h"
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| 11 | #include "io.h"
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| 12 | #include "stddefs.h"
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| 13 |
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| 14 | extern int _badfd(), _noper();
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| 15 | extern int _inifcb(), _opfcb();
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| 16 |
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| 17 | extern char *FilName(), *FilExt();
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| 18 |
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| 19 | int _fileop(), _filecl();
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| 20 |
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| 21 | static struct device condev = { 2, 2, 1, 0, _noper };
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| 22 | static struct device filedev = { 1, 1, 0, 1, _fileop };
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| 23 |
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| 24 | extern struct fcb _fcbtab[];
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| 25 |
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| 26 | /*
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| 27 | =============================================================================
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| 28 | device table: contains names and pointers to device control structures
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| 29 | =============================================================================
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| 30 | */
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| 31 |
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| 32 | static struct devtabl devtabl[] = {
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| 33 |
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| 34 | { "con:", &condev, 2 }, /* console device */
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| 35 | { "CON:", &condev, 2 },
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| 36 |
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| 37 | { 0, &filedev, 0 } /* this MUST be the last entry */
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| 38 | };
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| 39 |
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| 40 | /* |
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| 41 |
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| 42 | */
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| 43 |
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| 44 | /*
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| 45 | =============================================================================
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| 46 | open(name, flag, mode) -- Opens file 'name' with flags 'flag'
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| 47 | and access mode 'mode'. File will be ASCII unless opened with O_RAW.
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| 48 | Returns a file descriptor (small positive integer) if successful, or
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| 49 | FAILURE (-1) if an error occurred.
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| 50 | =============================================================================
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| 51 | */
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| 52 |
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| 53 | int
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| 54 | open(name, flag, mode)
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| 55 | char *name;
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| 56 | int flag, mode;
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| 57 | {
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| 58 | register struct devtabl *dp;
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| 59 | register struct channel *chp;
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| 60 | register struct device *dev;
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| 61 | int fd, mdmask;
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| 62 |
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| 63 | /* search for a free channel */
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| 64 |
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| 65 | for (chp = chantab, fd = 0 ; fd < MAXCHAN ; ++chp, ++fd)
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| 66 | if (chp->c_close EQ _badfd)
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| 67 | goto fndchan;
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| 68 |
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| 69 | errno = EMFILE; /* no channels available */
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| 70 | return(FAILURE);
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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 |
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| 76 | fndchan: /* found a channel to use */
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| 77 |
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| 78 | for (dp = devtabl; dp->d_name; ++dp) /* search for the device */
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| 79 | if (strcmp(dp->d_name, name) EQ 0)
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| 80 | break;
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| 81 |
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| 82 | dev = dp->d_dev;
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| 83 | mdmask = (flag & 3) + 1;
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| 84 |
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| 85 | if (mdmask & 1) { /* see if device is readable */
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| 86 |
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| 87 | if ((chp->c_read = dev->d_read) EQ 0) {
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| 88 |
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| 89 | errno = EACCES; /* can't read */
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| 90 | return(FAILURE);
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| 91 | }
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| 92 | }
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| 93 |
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| 94 | if (mdmask & 2) { /* see if device is writeable */
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| 95 |
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| 96 | if ((chp->c_write = dev->d_write) EQ 0) {
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| 97 |
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| 98 | errno = EACCES; /* can't write */
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| 99 | return(FAILURE);
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| 100 | }
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| 101 | }
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| 102 |
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| 103 | /* setup the channel table entries */
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| 104 |
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| 105 | chp->c_arg = dp->d_arg;
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| 106 | chp->c_ioctl = dev->d_ioctl;
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| 107 | chp->c_seek = dev->d_seek;
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| 108 | chp->c_close = _noper;
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| 109 |
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| 110 | if ((*dev->d_open)(name, flag, mode, chp, dp) < 0) { /* open */
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| 111 |
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| 112 | chp->c_close = _badfd; /* couldn't open for some reason */
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| 113 | return(FAILURE);
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| 114 | }
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| 115 |
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| 116 | return(fd);
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| 117 | }
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| 118 |
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| 119 | /* |
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| 120 |
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| 121 | */
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| 122 |
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| 123 | /*
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| 124 | =============================================================================
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| 125 | opena(name, flag, mode) -- Opens ASCII file 'name' with flags 'flag'
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| 126 | and access mode 'mode'. Newline translation will be done.
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| 127 | Returns a file descriptor (small positive integer) if successful, or
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| 128 | FAILURE (-1) if an error occurred.
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| 129 | =============================================================================
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| 130 | */
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| 131 |
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| 132 | int
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| 133 | opena(name, flag, mode)
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| 134 | char *name;
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| 135 | int flag, mode;
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| 136 | {
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| 137 | return(open(name, flag, mode));
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| 138 | }
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| 139 |
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| 140 | /*
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| 141 | =============================================================================
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| 142 | openb(name, flag, mode) -- Opens binary file 'name' with flags 'flag'
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| 143 | and access mode 'mode'. No newline translation is done.
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| 144 | Returns a file descriptor (small positive integer) if successful, or
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| 145 | FAILURE (-1) if an error occurred.
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| 146 | =============================================================================
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| 147 | */
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| 148 |
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| 149 | int
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| 150 | openb(name, flag, mode)
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| 151 | char *name;
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| 152 | int flag, mode;
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| 153 | {
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| 154 | return(open(name, flag|O_RAW, mode));
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| 155 | }
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| 156 |
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| 157 | /* |
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| 158 |
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| 159 | */
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| 160 |
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| 161 | /*
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| 162 | =============================================================================
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| 163 | creat(name, mode) -- Creates file 'name' with access mode 'mode'.
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| 164 | The created file is initially open for writing only. The file
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| 165 | will be ASCII unless mode contains O_RAW.
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| 166 | Returns a file descriptor (small positive integer) if successful, or
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| 167 | FAILURE (-1) if an error occurred.
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| 168 | =============================================================================
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| 169 | */
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| 170 |
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| 171 | int
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| 172 | creat(name, mode)
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| 173 | char *name;
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| 174 | int mode;
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| 175 | {
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| 176 | return(open(name, O_WRONLY|O_TRUNC|O_CREAT, mode));
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| 177 | }
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| 178 |
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| 179 | /* |
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| 180 |
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| 181 | */
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| 182 |
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| 183 | /*
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| 184 | =============================================================================
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| 185 | creata(name, mode) -- Creates ASCII file 'name' with access mode 'mode'.
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| 186 | The created file is initially open for writing only.
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| 187 | Files created with creata() do newline translations.
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| 188 | Returns a file descriptor (small positive integer) if successful, or
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| 189 | FAILURE (-1) if an error occurred.
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| 190 | =============================================================================
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| 191 | */
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| 192 |
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| 193 | int
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| 194 | creata(name, mode)
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| 195 | char *name;
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| 196 | int mode;
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| 197 | {
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| 198 | return(open(name, O_WRONLY|O_TRUNC|O_CREAT, mode));
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| 199 | }
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| 200 |
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| 201 | /*
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| 202 | =============================================================================
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| 203 | creatb(name, mode) -- create binary file 'name' with access mode 'mode'.
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| 204 | The created file is initially open for writing only.
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| 205 | Files created with creatb don't do newline translations.
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| 206 | Returns a file descriptor (small positive integer) if successful, or
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| 207 | FAILURE (-1) if an error occurred.
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| 208 | =============================================================================
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| 209 | */
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| 210 |
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| 211 | int
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| 212 | creatb(name, mode)
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| 213 | char *name;
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| 214 | int mode;
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| 215 | {
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| 216 | return(creat(name, O_WRONLY|O_TRUNC|O_CREAT|O_RAW, mode));
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| 217 | }
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| 218 |
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| 219 | /* |
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| 220 |
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| 221 | */
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| 222 |
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| 223 | /*
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| 224 | =============================================================================
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| 225 | _fileop(name, flag, mode, chp, dp) -- Opens disk file 'name' with
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| 226 | flags 'flag' in mode 'mode' with channel pointer 'chp' and
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| 227 | device pointer 'dp'. Returns SUCCESS (0) or FAILURE (-1).
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| 228 | =============================================================================
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| 229 | */
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| 230 |
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| 231 | int
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| 232 | _fileop(name, flag, mode, chp, dp)
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| 233 | char *name;
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| 234 | int flag, mode;
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| 235 | struct channel *chp;
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| 236 | struct devtabl *dp;
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| 237 | {
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| 238 | register struct fcb *fp;
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| 239 | char tmpname[9], tmpext[4];
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| 240 |
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| 241 | /* search for an available fcb entry */
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| 242 |
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| 243 | for (fp = _fcbtab; fp < (_fcbtab + MAXDFILE); ++fp)
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| 244 | if (fp->modefl EQ 0)
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| 245 | goto havefcb;
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| 246 |
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| 247 | errno = ENFILE; /* no fcb space available for file */
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| 248 | return (FAILURE);
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| 249 |
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| 250 | havefcb:
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| 251 |
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| 252 | /* setup the initial fcb */
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| 253 |
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| 254 | if (_inifcb(fp, FilName(name, tmpname), FilExt(name, tmpext), flag)) {
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| 255 |
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| 256 | errno = EINVAL; /* bad file name or flags */
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| 257 | return(FAILURE);
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| 258 | }
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| 259 |
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| 260 | if (_opfcb(fp)) /* open the file */
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| 261 | return(FAILURE);
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| 262 |
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| 263 | chp->c_arg = fp; /* allocate the channel */
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| 264 | chp->c_close = _filecl;
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| 265 |
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| 266 | return(SUCCESS);
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| 267 | }
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| 268 |
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