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Annotation of coherent/g/usr/bin/uudecode.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  */
        !            33: 
        !            34: #ifndef lint
        !            35: static char sccsid[] = "@(#)uudecode.c 5.10 (Berkeley) 6/1/90";
        !            36: #endif /* not lint */
        !            37: 
        !            38: /*
        !            39:  * uudecode [file ...]
        !            40:  *
        !            41:  * create the specified file, decoding as you go.
        !            42:  * used with uuencode.
        !            43:  */
        !            44: #include <sys/param.h>
        !            45: #include <sys/stat.h>
        !            46: #include <pwd.h>
        !            47: #include <stdio.h>
        !            48: #include <string.h>
        !            49: 
        !            50: #define MAXPATHLEN 128
        !            51: 
        !            52: char *filename;
        !            53: 
        !            54: /* ARGSUSED */
        !            55: main(argc, argv)
        !            56:        int argc;
        !            57:        char **argv;
        !            58: {
        !            59:        extern int errno;
        !            60:        int rval;
        !            61: 
        !            62:        if (*++argv) {
        !            63:                rval = 0;
        !            64:                do {
        !            65:                        if (!freopen(filename = *argv, "r", stdin)) {
        !            66:                                (void)fprintf(stderr, "uudecode: %s: %s\n",
        !            67:                                    *argv, strerror(errno));
        !            68:                                rval = 1;
        !            69:                                continue;
        !            70:                        }
        !            71:                        rval |= decode();
        !            72:                } while (*++argv);
        !            73:        } else {
        !            74:                filename = "stdin";
        !            75:                rval = decode();
        !            76:        }
        !            77:        exit(rval);
        !            78: }
        !            79: 
        !            80: decode()
        !            81: {
        !            82:        extern int errno;
        !            83:        struct passwd *pw;
        !            84:        register int n;
        !            85:        register char ch, *p;
        !            86:        int mode, n1;
        !            87:        char buf[MAXPATHLEN];
        !            88: 
        !            89:        /* search for header line */
        !            90:        do {
        !            91:                if (!fgets(buf, sizeof(buf), stdin)) {
        !            92:                        (void)fprintf(stderr,
        !            93:                            "uudecode: %s: no \"begin\" line\n", filename);
        !            94:                        return(1);
        !            95:                }
        !            96:        } while (strncmp(buf, "begin ", 6));
        !            97:        (void)sscanf(buf, "begin %o %s", &mode, buf);
        !            98: 
        !            99:        /* handle ~user/file format */
        !           100:        if (buf[0] == '~') {
        !           101:                if (!(p = index(buf, '/'))) {
        !           102:                        (void)fprintf(stderr, "uudecode: %s: illegal ~user.\n",
        !           103:                            filename);
        !           104:                        return(1);
        !           105:                }
        !           106:                *p++ = NULL;
        !           107:                if (!(pw = getpwnam(buf + 1))) {
        !           108:                        (void)fprintf(stderr, "uudecode: %s: no user %s.\n",
        !           109:                            filename, buf);
        !           110:                        return(1);
        !           111:                }
        !           112:                n = strlen(pw->pw_dir);
        !           113:                n1 = strlen(p);
        !           114:                if (n + n1 + 2 > MAXPATHLEN) {
        !           115:                        (void)fprintf(stderr, "uudecode: %s: path too long.\n",
        !           116:                            filename);
        !           117:                        return(1);
        !           118:                }
        !           119:                /*
        !           120:                 *      bcopy(p, buf + n + 1, n1 + 1);
        !           121:                 *      bcopy(pw->pw_dir, buf, n);
        !           122:                 *      buf[n] = '/';
        !           123:                 */
        !           124:                sprintf(buf, "%s/%s", pw->pw_dir, p);
        !           125:        }
        !           126: 
        !           127:        /* create output file, set mode */
        !           128:        if (!freopen(buf, "w", stdout) || chmod(buf, mode&0666) == -1) {
        !           129:                (void)fprintf(stderr, "uudecode: %s: %s: %s\n", buf,
        !           130:                    filename, strerror(errno));
        !           131:                return(1);
        !           132:        }
        !           133: 
        !           134:        /* for each input line */
        !           135:        for (;;) {
        !           136:                if (!fgets(p = buf, sizeof(buf), stdin)) {
        !           137:                        (void)fprintf(stderr, "uudecode: %s: short file.\n",
        !           138:                            filename);
        !           139:                        return(1);
        !           140:                }
        !           141: #define        DEC(c)  (((c) - ' ') & 077)             /* single character decode */
        !           142:                /*
        !           143:                 * `n' is used to avoid writing out all the characters
        !           144:                 * at the end of the file.
        !           145:                 */
        !           146:                if ((n = DEC(*p)) <= 0)
        !           147:                        break;
        !           148:                for (++p; n > 0; p += 4, n -= 3)
        !           149:                        if (n >= 3) {
        !           150:                                ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
        !           151:                                putchar(ch);
        !           152:                                ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
        !           153:                                putchar(ch);
        !           154:                                ch = DEC(p[2]) << 6 | DEC(p[3]);
        !           155:                                putchar(ch);
        !           156:                        }
        !           157:                        else {
        !           158:                                if (n >= 1) {
        !           159:                                        ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
        !           160:                                        putchar(ch);
        !           161:                                }
        !           162:                                if (n >= 2) {
        !           163:                                        ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
        !           164:                                        putchar(ch);
        !           165:                                }
        !           166:                                if (n >= 3) {
        !           167:                                        ch = DEC(p[2]) << 6 | DEC(p[3]);
        !           168:                                        putchar(ch);
        !           169:                                }
        !           170:                        }
        !           171:        }
        !           172:        if (!fgets(buf, sizeof(buf), stdin) || strcmp(buf, "end\n")) {
        !           173:                (void)fprintf(stderr, "uudecode: %s: no \"end\" line.\n",
        !           174:                    filename);
        !           175:                return(1);
        !           176:        }
        !           177:        return(0);
        !           178: }
        !           179: 
        !           180: usage()
        !           181: {
        !           182:        (void)fprintf(stderr, "usage: uudecode [file ...]\n");
        !           183:        exit(1);
        !           184: }

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