Return to getttyent.c CVS log

Up to [CSRG BSD Unix] / 43BSDReno / lib / libc / gen

Annotation of 43BSDReno/lib/libc/gen/getttyent.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1989 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #if defined(LIBC_SCCS) && !defined(lint)
        !            21: static char sccsid[] = "@(#)getttyent.c        5.8 (Berkeley) 6/1/90";
        !            22: #endif /* LIBC_SCCS and not lint */
        !            23: 
        !            24: #include <ttyent.h>
        !            25: #include <stdio.h>
        !            26: #include <ctype.h>
        !            27: #include <string.h>
        !            28: 
        !            29: static char zapchar;
        !            30: static FILE *tf;
        !            31: 
        !            32: struct ttyent *
        !            33: getttynam(tty)
        !            34:        char *tty;
        !            35: {
        !            36:        register struct ttyent *t;
        !            37: 
        !            38:        setttyent();
        !            39:        while (t = getttyent())
        !            40:                if (!strcmp(tty, t->ty_name))
        !            41:                        break;
        !            42:        return(t);
        !            43: }
        !            44: 
        !            45: struct ttyent *
        !            46: getttyent()
        !            47: {
        !            48:        static struct ttyent tty;
        !            49:        register int c;
        !            50:        register char *p;
        !            51: #define        MAXLINELENGTH   100
        !            52:        static char line[MAXLINELENGTH];
        !            53:        char *skip(), *value();
        !            54: 
        !            55:        if (!tf && !setttyent())
        !            56:                return(NULL);
        !            57:        for (;;) {
        !            58:                if (!fgets(p = line, sizeof(line), tf))
        !            59:                        return(NULL);
        !            60:                /* skip lines that are too big */
        !            61:                if (!index(p, '\n')) {
        !            62:                        while ((c = getc(tf)) != '\n' && c != EOF)
        !            63:                                ;
        !            64:                        continue;
        !            65:                }
        !            66:                while (isspace(*p))
        !            67:                        ++p;
        !            68:                if (*p && *p != '#')
        !            69:                        break;
        !            70:        }
        !            71: 
        !            72:        zapchar = 0;
        !            73:        tty.ty_name = p;
        !            74:        p = skip(p);
        !            75:        if (!*(tty.ty_getty = p))
        !            76:                tty.ty_getty = tty.ty_type = NULL;
        !            77:        else {
        !            78:                p = skip(p);
        !            79:                if (!*(tty.ty_type = p))
        !            80:                        tty.ty_type = NULL;
        !            81:                else
        !            82:                        p = skip(p);
        !            83:        }
        !            84:        tty.ty_status = 0;
        !            85:        tty.ty_window = NULL;
        !            86: 
        !            87: #define        scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1])
        !            88: #define        vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
        !            89:        for (; *p; p = skip(p)) {
        !            90:                if (scmp(_TTYS_OFF))
        !            91:                        tty.ty_status &= ~TTY_ON;
        !            92:                else if (scmp(_TTYS_ON))
        !            93:                        tty.ty_status |= TTY_ON;
        !            94:                else if (scmp(_TTYS_SECURE))
        !            95:                        tty.ty_status |= TTY_SECURE;
        !            96:                else if (vcmp(_TTYS_WINDOW))
        !            97:                        tty.ty_window = value(p);
        !            98:                else
        !            99:                        break;
        !           100:        }
        !           101: 
        !           102:        if (zapchar == '#' || *p == '#')
        !           103:                while ((c = *++p) == ' ' || c == '\t')
        !           104:                        ;
        !           105:        tty.ty_comment = p;
        !           106:        if (*p == 0)
        !           107:                tty.ty_comment = 0;
        !           108:        if (p = index(p, '\n'))
        !           109:                *p = '\0';
        !           110:        return(&tty);
        !           111: }
        !           112: 
        !           113: #define        QUOTED  1
        !           114: 
        !           115: /*
        !           116:  * Skip over the current field, removing quotes, and return a pointer to
        !           117:  * the next field.
        !           118:  */
        !           119: static char *
        !           120: skip(p)
        !           121:        register char *p;
        !           122: {
        !           123:        register char *t;
        !           124:        register int c, q;
        !           125: 
        !           126:        for (q = 0, t = p; (c = *p) != '\0'; p++) {
        !           127:                if (c == '"') {
        !           128:                        q ^= QUOTED;    /* obscure, but nice */
        !           129:                        continue;
        !           130:                }
        !           131:                if (q == QUOTED && *p == '\\' && *(p+1) == '"')
        !           132:                        p++;
        !           133:                *t++ = *p;
        !           134:                if (q == QUOTED)
        !           135:                        continue;
        !           136:                if (c == '#') {
        !           137:                        zapchar = c;
        !           138:                        *p = 0;
        !           139:                        break;
        !           140:                }
        !           141:                if (c == '\t' || c == ' ' || c == '\n') {
        !           142:                        zapchar = c;
        !           143:                        *p++ = 0;
        !           144:                        while ((c = *p) == '\t' || c == ' ' || c == '\n')
        !           145:                                p++;
        !           146:                        break;
        !           147:                }
        !           148:        }
        !           149:        *--t = '\0';
        !           150:        return(p);
        !           151: }
        !           152: 
        !           153: static char *
        !           154: value(p)
        !           155:        register char *p;
        !           156: {
        !           157:        return((p = index(p, '=')) ? ++p : NULL);
        !           158: }
        !           159: 
        !           160: setttyent()
        !           161: {
        !           162:        if (tf) {
        !           163:                (void)rewind(tf);
        !           164:                return(1);
        !           165:        } else if (tf = fopen(_PATH_TTYS, "r"))
        !           166:                return(1);
        !           167:        return(0);
        !           168: }
        !           169: 
        !           170: endttyent()
        !           171: {
        !           172:        int rval;
        !           173: 
        !           174:        if (tf) {
        !           175:                rval = !(fclose(tf) == EOF);
        !           176:                tf = NULL;
        !           177:                return(rval);
        !           178:        }
        !           179:        return(1);
        !           180: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.