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Annotation of mandoc/manpath.c, Revision 1.18

1.18    ! schwarze    1: /*     $Id: manpath.c,v 1.17 2014/08/16 19:00:01 schwarze Exp $ */
1.1       kristaps    2: /*
1.18    ! schwarze    3:  * Copyright (c) 2011, 2014 Ingo Schwarze <schwarze@openbsd.org>
1.1       kristaps    4:  * Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
                      5:  *
                      6:  * Permission to use, copy, modify, and distribute this software for any
                      7:  * purpose with or without fee is hereby granted, provided that the above
                      8:  * copyright notice and this permission notice appear in all copies.
                      9:  *
                     10:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     11:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     12:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     13:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     14:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     15:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     16:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     17:  */
                     18: #include "config.h"
1.16      schwarze   19:
                     20: #include <sys/types.h>
1.18    ! schwarze   21: #include <sys/stat.h>
1.1       kristaps   22:
                     23: #include <assert.h>
                     24: #include <ctype.h>
                     25: #include <limits.h>
                     26: #include <stdio.h>
                     27: #include <stdlib.h>
                     28: #include <string.h>
                     29:
1.13      schwarze   30: #include "mandoc_aux.h"
1.1       kristaps   31: #include "manpath.h"
                     32:
                     33: #define MAN_CONF_FILE  "/etc/man.conf"
                     34: #define MAN_CONF_KEY   "_whatdb"
                     35:
1.18    ! schwarze   36: static void     manpath_add(struct manpaths *, const char *, int);
        !            37: static void     manpath_parseline(struct manpaths *, char *, int);
1.1       kristaps   38:
                     39: void
1.5       schwarze   40: manpath_parse(struct manpaths *dirs, const char *file,
                     41:                char *defp, char *auxp)
1.1       kristaps   42: {
1.17      schwarze   43: #if HAVE_MANPATH
1.11      schwarze   44:        char             cmd[(PATH_MAX * 3) + 20];
1.6       kristaps   45:        FILE            *stream;
                     46:        char            *buf;
                     47:        size_t           sz, bsz;
                     48:
                     49:        strlcpy(cmd, "manpath", sizeof(cmd));
                     50:        if (file) {
                     51:                strlcat(cmd, " -C ", sizeof(cmd));
                     52:                strlcat(cmd, file, sizeof(cmd));
                     53:        }
                     54:        if (auxp) {
                     55:                strlcat(cmd, " -m ", sizeof(cmd));
                     56:                strlcat(cmd, auxp, sizeof(cmd));
                     57:        }
                     58:        if (defp) {
                     59:                strlcat(cmd, " -M ", sizeof(cmd));
                     60:                strlcat(cmd, defp, sizeof(cmd));
                     61:        }
                     62:
                     63:        /* Open manpath(1).  Ignore errors. */
                     64:
                     65:        stream = popen(cmd, "r");
                     66:        if (NULL == stream)
                     67:                return;
                     68:
                     69:        buf = NULL;
                     70:        bsz = 0;
                     71:
                     72:        /* Read in as much output as we can. */
                     73:
                     74:        do {
                     75:                buf = mandoc_realloc(buf, bsz + 1024);
1.9       kristaps   76:                sz = fread(buf + bsz, 1, 1024, stream);
1.6       kristaps   77:                bsz += sz;
                     78:        } while (sz > 0);
                     79:
                     80:        if ( ! ferror(stream) && feof(stream) &&
                     81:                        bsz && '\n' == buf[bsz - 1]) {
                     82:                buf[bsz - 1] = '\0';
                     83:                manpath_parseline(dirs, buf);
                     84:        }
1.1       kristaps   85:
1.6       kristaps   86:        free(buf);
                     87:        pclose(stream);
                     88: #else
1.8       kristaps   89:        char            *insert;
1.4       schwarze   90:
1.8       kristaps   91:        /* Always prepend -m. */
1.18    ! schwarze   92:        manpath_parseline(dirs, auxp, 1);
1.10      schwarze   93:
1.8       kristaps   94:        /* If -M is given, it overrides everything else. */
                     95:        if (NULL != defp) {
1.18    ! schwarze   96:                manpath_parseline(dirs, defp, 1);
1.8       kristaps   97:                return;
                     98:        }
1.1       kristaps   99:
1.8       kristaps  100:        /* MANPATH and man.conf(5) cooperate. */
                    101:        defp = getenv("MANPATH");
                    102:        if (NULL == file)
                    103:                file = MAN_CONF_FILE;
                    104:
                    105:        /* No MANPATH; use man.conf(5) only. */
                    106:        if (NULL == defp || '\0' == defp[0]) {
                    107:                manpath_manconf(dirs, file);
                    108:                return;
                    109:        }
                    110:
                    111:        /* Prepend man.conf(5) to MANPATH. */
                    112:        if (':' == defp[0]) {
                    113:                manpath_manconf(dirs, file);
1.18    ! schwarze  114:                manpath_parseline(dirs, defp, 0);
1.8       kristaps  115:                return;
                    116:        }
                    117:
                    118:        /* Append man.conf(5) to MANPATH. */
1.9       kristaps  119:        if (':' == defp[strlen(defp) - 1]) {
1.18    ! schwarze  120:                manpath_parseline(dirs, defp, 0);
1.8       kristaps  121:                manpath_manconf(dirs, file);
                    122:                return;
                    123:        }
                    124:
                    125:        /* Insert man.conf(5) into MANPATH. */
                    126:        insert = strstr(defp, "::");
                    127:        if (NULL != insert) {
                    128:                *insert++ = '\0';
1.18    ! schwarze  129:                manpath_parseline(dirs, defp, 0);
1.8       kristaps  130:                manpath_manconf(dirs, file);
1.18    ! schwarze  131:                manpath_parseline(dirs, insert + 1, 0);
1.8       kristaps  132:                return;
                    133:        }
                    134:
                    135:        /* MANPATH overrides man.conf(5) completely. */
1.18    ! schwarze  136:        manpath_parseline(dirs, defp, 0);
1.6       kristaps  137: #endif
1.1       kristaps  138: }
                    139:
                    140: /*
                    141:  * Parse a FULL pathname from a colon-separated list of arrays.
                    142:  */
1.6       kristaps  143: static void
1.18    ! schwarze  144: manpath_parseline(struct manpaths *dirs, char *path, int complain)
1.1       kristaps  145: {
                    146:        char    *dir;
                    147:
                    148:        if (NULL == path)
                    149:                return;
                    150:
                    151:        for (dir = strtok(path, ":"); dir; dir = strtok(NULL, ":"))
1.18    ! schwarze  152:                manpath_add(dirs, dir, complain);
1.1       kristaps  153: }
                    154:
                    155: /*
                    156:  * Add a directory to the array, ignoring bad directories.
                    157:  * Grow the array one-by-one for simplicity's sake.
                    158:  */
                    159: static void
1.18    ! schwarze  160: manpath_add(struct manpaths *dirs, const char *dir, int complain)
1.1       kristaps  161: {
                    162:        char             buf[PATH_MAX];
1.18    ! schwarze  163:        struct stat      sb;
1.1       kristaps  164:        char            *cp;
1.9       kristaps  165:        size_t           i;
1.1       kristaps  166:
1.18    ! schwarze  167:        if (NULL == (cp = realpath(dir, buf))) {
        !           168:                if (complain) {
        !           169:                        fputs("manpath: ", stderr);
        !           170:                        perror(dir);
        !           171:                }
1.1       kristaps  172:                return;
1.18    ! schwarze  173:        }
1.1       kristaps  174:
                    175:        for (i = 0; i < dirs->sz; i++)
                    176:                if (0 == strcmp(dirs->paths[i], dir))
                    177:                        return;
                    178:
1.18    ! schwarze  179:        if (stat(cp, &sb) == -1) {
        !           180:                if (complain) {
        !           181:                        fputs("manpath: ", stderr);
        !           182:                        perror(dir);
        !           183:                }
        !           184:                return;
        !           185:        }
        !           186:
1.15      schwarze  187:        dirs->paths = mandoc_reallocarray(dirs->paths,
                    188:            dirs->sz + 1, sizeof(char *));
1.1       kristaps  189:
                    190:        dirs->paths[dirs->sz++] = mandoc_strdup(cp);
1.2       kristaps  191: }
                    192:
                    193: void
                    194: manpath_free(struct manpaths *p)
                    195: {
1.9       kristaps  196:        size_t           i;
1.2       kristaps  197:
                    198:        for (i = 0; i < p->sz; i++)
                    199:                free(p->paths[i]);
                    200:
                    201:        free(p->paths);
                    202: }
                    203:
                    204: void
1.5       schwarze  205: manpath_manconf(struct manpaths *dirs, const char *file)
1.2       kristaps  206: {
                    207:        FILE            *stream;
1.1       kristaps  208:        char            *p, *q;
1.4       schwarze  209:        size_t           len, keysz;
1.1       kristaps  210:
                    211:        keysz = strlen(MAN_CONF_KEY);
                    212:        assert(keysz > 0);
                    213:
1.3       kristaps  214:        if (NULL == (stream = fopen(file, "r")))
1.1       kristaps  215:                return;
                    216:
                    217:        while (NULL != (p = fgetln(stream, &len))) {
                    218:                if (0 == len || '\n' != p[--len])
                    219:                        break;
                    220:                p[len] = '\0';
                    221:                while (isspace((unsigned char)*p))
                    222:                        p++;
                    223:                if (strncmp(MAN_CONF_KEY, p, keysz))
                    224:                        continue;
                    225:                p += keysz;
1.12      schwarze  226:                while (isspace((unsigned char)*p))
1.1       kristaps  227:                        p++;
                    228:                if ('\0' == *p)
                    229:                        continue;
                    230:                if (NULL == (q = strrchr(p, '/')))
                    231:                        continue;
                    232:                *q = '\0';
1.18    ! schwarze  233:                manpath_add(dirs, p, 0);
1.1       kristaps  234:        }
                    235:
                    236:        fclose(stream);
                    237: }

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