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Annotation of mandoc/manpath.c, Revision 1.2

1.2     ! kristaps    1: /*     $Id: manpath.c,v 1.1 2011/11/23 09:47:38 kristaps Exp $ */
1.1       kristaps    2: /*
                      3:  * Copyright (c) 2011 Ingo Schwarze <schwarze@openbsd.org>
                      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: #ifdef HAVE_CONFIG_H
                     19: #include "config.h"
                     20: #endif
                     21:
                     22: #include <assert.h>
                     23: #include <ctype.h>
                     24: #include <limits.h>
                     25: #include <stdio.h>
                     26: #include <stdlib.h>
                     27: #include <string.h>
                     28:
                     29: #include "mandoc.h"
                     30: #include "manpath.h"
                     31:
                     32: #define MAN_CONF_FILE  "/etc/man.conf"
                     33: #define MAN_CONF_KEY   "_whatdb"
                     34:
                     35: static void     manpath_add(struct manpaths *, const char *);
                     36:
                     37: void
                     38: manpath_parse(struct manpaths *dirs, char *defp, char *auxp)
                     39: {
                     40:
                     41:        if (NULL != getenv("MANPATH"))
                     42:                defp = getenv("MANPATH");
                     43:
                     44:        if (NULL == defp)
                     45:                manpath_parseconf(dirs);
                     46:        else
                     47:                manpath_parseline(dirs, defp);
                     48:
                     49:        manpath_parseline(dirs, auxp);
                     50: }
                     51:
                     52: /*
                     53:  * Parse a FULL pathname from a colon-separated list of arrays.
                     54:  */
                     55: void
                     56: manpath_parseline(struct manpaths *dirs, char *path)
                     57: {
                     58:        char    *dir;
                     59:
                     60:        if (NULL == path)
                     61:                return;
                     62:
                     63:        for (dir = strtok(path, ":"); dir; dir = strtok(NULL, ":"))
                     64:                manpath_add(dirs, dir);
                     65: }
                     66:
                     67: /*
                     68:  * Add a directory to the array, ignoring bad directories.
                     69:  * Grow the array one-by-one for simplicity's sake.
                     70:  */
                     71: static void
                     72: manpath_add(struct manpaths *dirs, const char *dir)
                     73: {
                     74:        char             buf[PATH_MAX];
                     75:        char            *cp;
                     76:        int              i;
                     77:
                     78:        if (NULL == (cp = realpath(dir, buf)))
                     79:                return;
                     80:
                     81:        for (i = 0; i < dirs->sz; i++)
                     82:                if (0 == strcmp(dirs->paths[i], dir))
                     83:                        return;
                     84:
                     85:        dirs->paths = mandoc_realloc
                     86:                (dirs->paths,
                     87:                 ((size_t)dirs->sz + 1) * sizeof(char *));
                     88:
                     89:        dirs->paths[dirs->sz++] = mandoc_strdup(cp);
                     90: }
                     91:
                     92: void
                     93: manpath_parseconf(struct manpaths *dirs)
                     94: {
1.2     ! kristaps   95: #ifdef USE_MANPATH
1.1       kristaps   96:        FILE            *stream;
                     97:        char            *buf;
                     98:        size_t           sz, bsz;
                     99:
                    100:        /* Open manpath(1).  Ignore errors. */
                    101:
                    102:        stream = popen("manpath", "r");
                    103:        if (NULL == stream)
                    104:                return;
                    105:
                    106:        buf = NULL;
                    107:        bsz = 0;
                    108:
                    109:        /* Read in as much output as we can. */
                    110:
                    111:        do {
                    112:                buf = mandoc_realloc(buf, bsz + 1024);
                    113:                sz = fread(buf + (int)bsz, 1, 1024, stream);
                    114:                bsz += sz;
                    115:        } while (sz > 0);
                    116:
                    117:        if ( ! ferror(stream) && feof(stream) &&
                    118:                        bsz && '\n' == buf[bsz - 1]) {
                    119:                buf[bsz - 1] = '\0';
                    120:                manpath_parseline(dirs, buf);
                    121:        }
                    122:
                    123:        free(buf);
                    124:        pclose(stream);
                    125: #else
1.2     ! kristaps  126:        manpath_manconf(dirs);
        !           127: #endif
        !           128: }
        !           129:
        !           130: void
        !           131: manpath_free(struct manpaths *p)
        !           132: {
        !           133:        int              i;
        !           134:
        !           135:        for (i = 0; i < p->sz; i++)
        !           136:                free(p->paths[i]);
        !           137:
        !           138:        free(p->paths);
        !           139: }
        !           140:
        !           141: void
        !           142: manpath_manconf(struct manpaths *dirs)
        !           143: {
        !           144:        FILE            *stream;
1.1       kristaps  145:        char            *p, *q;
                    146:        size_t           len, keysz;
                    147:
                    148:        keysz = strlen(MAN_CONF_KEY);
                    149:        assert(keysz > 0);
                    150:
                    151:        if (NULL == (stream = fopen(MAN_CONF_FILE, "r")))
                    152:                return;
                    153:
                    154:        while (NULL != (p = fgetln(stream, &len))) {
                    155:                if (0 == len || '\n' != p[--len])
                    156:                        break;
                    157:                p[len] = '\0';
                    158:                while (isspace((unsigned char)*p))
                    159:                        p++;
                    160:                if (strncmp(MAN_CONF_KEY, p, keysz))
                    161:                        continue;
                    162:                p += keysz;
                    163:                while (isspace(*p))
                    164:                        p++;
                    165:                if ('\0' == *p)
                    166:                        continue;
                    167:                if (NULL == (q = strrchr(p, '/')))
                    168:                        continue;
                    169:                *q = '\0';
                    170:                manpath_add(dirs, p);
                    171:        }
                    172:
                    173:        fclose(stream);
                    174: }

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