[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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[0580615] | 14 | extern int _badfd(void);
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| 15 | extern int _noper(void);
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| 16 | extern int _inifcb(struct fcb *fcp, char *name, char *ext, int mode);
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| 17 | extern int _opfcb(struct fcb *fcp);
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[f40a309] | 18 |
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[0580615] | 19 | extern char *FilName(char *s, char *p);
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| 20 | extern char *FilExt(char *s, char *p);
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[f40a309] | 21 |
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[0580615] | 22 | int _fileop(char *name, int flag, int mode, struct channel *chp, struct devtabl *dp);
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| 23 | int _filecl(struct fcb *fp);
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[f40a309] | 24 |
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| 25 | static struct device condev = { 2, 2, 1, 0, _noper };
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| 26 | static struct device filedev = { 1, 1, 0, 1, _fileop };
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| 27 |
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| 28 | extern struct fcb _fcbtab[];
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| 29 |
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| 30 | /*
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| 31 | =============================================================================
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| 32 | device table: contains names and pointers to device control structures
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| 33 | =============================================================================
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| 34 | */
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| 35 |
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| 36 | static struct devtabl devtabl[] = {
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| 37 |
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| 38 | { "con:", &condev, 2 }, /* console device */
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| 39 | { "CON:", &condev, 2 },
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| 40 |
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| 41 | { 0, &filedev, 0 } /* this MUST be the last entry */
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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 | */
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| 47 |
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| 48 | /*
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| 49 | =============================================================================
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| 50 | open(name, flag, mode) -- Opens file 'name' with flags 'flag'
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| 51 | and access mode 'mode'. File will be ASCII unless opened with O_RAW.
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| 52 | Returns a file descriptor (small positive integer) if successful, or
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| 53 | FAILURE (-1) if an error occurred.
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| 54 | =============================================================================
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| 55 | */
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[0580615] | 56 |
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[f40a309] | 57 | int open(char *name, int flag, int mode)
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| 58 | {
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| 59 | register struct devtabl *dp;
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| 60 | register struct channel *chp;
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| 61 | register struct device *dev;
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| 62 | int fd, mdmask;
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| 63 |
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| 64 | /* search for a free channel */
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| 65 |
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| 66 | for (chp = chantab, fd = 0 ; fd < MAXCHAN ; ++chp, ++fd)
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| 67 | if (chp->c_close EQ _badfd)
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| 68 | goto fndchan;
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| 69 |
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| 70 | errno = EMFILE; /* no channels available */
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| 71 | return(FAILURE);
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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 |
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| 77 | fndchan: /* found a channel to use */
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| 78 |
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| 79 | for (dp = devtabl; dp->d_name; ++dp) /* search for the device */
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| 80 | if (strcmp(dp->d_name, name) EQ 0)
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| 81 | break;
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| 82 |
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| 83 | dev = dp->d_dev;
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| 84 | mdmask = (flag & 3) + 1;
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| 85 |
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| 86 | if (mdmask & 1) { /* see if device is readable */
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| 87 |
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| 88 | if ((chp->c_read = dev->d_read) EQ 0) {
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| 89 |
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| 90 | errno = EACCES; /* can't read */
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| 91 | return(FAILURE);
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| 92 | }
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| 93 | }
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| 94 |
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| 95 | if (mdmask & 2) { /* see if device is writeable */
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| 96 |
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| 97 | if ((chp->c_write = dev->d_write) EQ 0) {
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| 98 |
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| 99 | errno = EACCES; /* can't write */
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| 100 | return(FAILURE);
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| 101 | }
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| 102 | }
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| 103 |
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| 104 | /* setup the channel table entries */
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| 105 |
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| 106 | chp->c_arg = dp->d_arg;
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| 107 | chp->c_ioctl = dev->d_ioctl;
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| 108 | chp->c_seek = dev->d_seek;
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| 109 | chp->c_close = _noper;
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| 110 |
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| 111 | if ((*dev->d_open)(name, flag, mode, chp, dp) < 0) { /* open */
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| 112 |
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| 113 | chp->c_close = _badfd; /* couldn't open for some reason */
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| 114 | return(FAILURE);
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| 115 | }
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| 116 |
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| 117 | return(fd);
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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 | =============================================================================
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| 126 | opena(name, flag, mode) -- Opens ASCII file 'name' with flags 'flag'
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| 127 | and access mode 'mode'. Newline translation will be done.
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| 128 | Returns a file descriptor (small positive integer) if successful, or
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| 129 | FAILURE (-1) if an error occurred.
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[0580615] | 130 | =============================================================================
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[f40a309] | 131 | */
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| 132 |
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| 133 | int opena(char *name, int flag, int mode)
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| 134 | {
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| 135 | return(open(name, flag, mode));
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| 136 | }
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| 137 |
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| 138 | /*
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| 139 | =============================================================================
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| 140 | openb(name, flag, mode) -- Opens binary file 'name' with flags 'flag'
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| 141 | and access mode 'mode'. No newline translation is done.
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| 142 | Returns a file descriptor (small positive integer) if successful, or
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| 143 | FAILURE (-1) if an error occurred.
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[0580615] | 144 | =============================================================================
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[f40a309] | 145 | */
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| 146 |
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| 147 | int openb(char *name, int flag, int mode)
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| 148 | {
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| 149 | return(open(name, flag|O_RAW, mode));
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| 150 | }
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| 151 |
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| 152 | /* |
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| 153 |
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| 154 | */
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| 155 |
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| 156 | /*
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| 157 | =============================================================================
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| 158 | creat(name, mode) -- Creates file 'name' with access mode 'mode'.
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| 159 | The created file is initially open for writing only. The file
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| 160 | will be ASCII unless mode contains O_RAW.
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| 161 | Returns a file descriptor (small positive integer) if successful, or
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[0580615] | 162 | FAILURE (-1) if an error occurred.
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[f40a309] | 163 | =============================================================================
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| 164 | */
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| 165 |
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| 166 | int creat(char *name, int mode)
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| 167 | {
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| 168 | return(open(name, O_WRONLY|O_TRUNC|O_CREAT, mode));
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| 169 | }
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| 170 |
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| 171 | /* |
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| 172 |
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| 173 | */
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| 174 |
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| 175 | /*
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| 176 | =============================================================================
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| 177 | creata(name, mode) -- Creates ASCII file 'name' with access mode 'mode'.
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| 178 | The created file is initially open for writing only.
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| 179 | Files created with creata() do newline translations.
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[0580615] | 180 | Returns a file descriptor (small positive integer) if successful, or
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[f40a309] | 181 | FAILURE (-1) if an error occurred.
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| 182 | =============================================================================
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| 183 | */
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| 184 |
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| 185 | int creata(char *name, int mode)
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| 186 | {
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| 187 | return(open(name, O_WRONLY|O_TRUNC|O_CREAT, mode));
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| 188 | }
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| 189 |
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| 190 | /*
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| 191 | =============================================================================
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| 192 | creatb(name, mode) -- create binary file 'name' with access mode 'mode'.
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| 193 | The created file is initially open for writing only.
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| 194 | Files created with creatb don't do newline translations.
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[0580615] | 195 | Returns a file descriptor (small positive integer) if successful, or
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[f40a309] | 196 | FAILURE (-1) if an error occurred.
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[1127e68] | 197 | =============================================================================
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[f40a309] | 198 | */
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| 199 |
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| 200 | int creatb(char *name, int mode)
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| 201 | {
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| 202 | return(open(name, O_WRONLY|O_TRUNC|O_CREAT|O_RAW, mode));
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| 203 | }
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| 204 |
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| 205 | /* |
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| 206 |
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| 207 | */
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| 208 |
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| 209 | /*
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| 210 | =============================================================================
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[0580615] | 211 | _fileop(name, flag, mode, chp, dp) -- Opens disk file 'name' with
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[f40a309] | 212 | flags 'flag' in mode 'mode' with channel pointer 'chp' and
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| 213 | device pointer 'dp'. Returns SUCCESS (0) or FAILURE (-1).
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| 214 | =============================================================================
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| 215 | */
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| 216 |
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| 217 | int _fileop(char *name, int flag, int mode, struct channel *chp, struct devtabl *dp)
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| 218 | {
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| 219 | register struct fcb *fp;
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| 220 | char tmpname[9], tmpext[4];
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| 221 |
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| 222 | /* search for an available fcb entry */
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| 223 |
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| 224 | for (fp = _fcbtab; fp < (_fcbtab + MAXDFILE); ++fp)
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| 225 | if (fp->modefl EQ 0)
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| 226 | goto havefcb;
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| 227 |
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| 228 | errno = ENFILE; /* no fcb space available for file */
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| 229 | return (FAILURE);
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| 230 |
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| 231 | havefcb:
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| 232 |
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| 233 | /* setup the initial fcb */
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| 234 |
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| 235 | if (_inifcb(fp, FilName(name, tmpname), FilExt(name, tmpext), flag)) {
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| 236 |
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| 237 | errno = EINVAL; /* bad file name or flags */
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| 238 | return(FAILURE);
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| 239 | }
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| 240 |
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| 241 | if (_opfcb(fp)) /* open the file */
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| 242 | return(FAILURE);
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| 243 |
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| 244 | chp->c_arg = fp; /* allocate the channel */
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| 245 | chp->c_close = _filecl;
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| 246 |
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| 247 | return(SUCCESS);
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| 248 | }
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| 249 |
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