i2cdump: don't read block data in non-block modes
[oweals/busybox.git] / miscutils / man.c
index 611466349c47c1a7f2b550eebb1188012f35018a..58ed81955bd2318f8dba9d635b709c3b9dea1b10 100644 (file)
@@ -66,7 +66,7 @@ static int run_pipe(const char *pager, char *man_filename, int man, int level)
                        goto ordinary_manpage;
 
                line = xmalloc_open_zipped_read_close(man_filename, NULL);
-               if (!line || strncmp(line, ".so ", 4) != 0) {
+               if (!line || !is_prefixed_with(line, ".so ")) {
                        free(line);
                        goto ordinary_manpage;
                }
@@ -102,11 +102,12 @@ static int run_pipe(const char *pager, char *man_filename, int man, int level)
 
  ordinary_manpage:
        close(STDIN_FILENO);
-       open_zipped(man_filename); /* guaranteed to use fd 0 (STDIN_FILENO) */
+       open_zipped(man_filename, /*fail_if_not_compressed:*/ 0); /* guaranteed to use fd 0 (STDIN_FILENO) */
        /* "2>&1" is added so that nroff errors are shown in pager too.
         * Otherwise it may show just empty screen */
        cmd = xasprintf(
-               man ? "gtbl | nroff -Tlatin1 -mandoc 2>&1 | %s"
+               /* replaced -Tlatin1 with -Tascii for non-UTF8 displays */
+               man ? "gtbl | nroff -Tascii -mandoc 2>&1 | %s"
                    : "%s",
                pager);
        system(cmd);
@@ -129,38 +130,68 @@ static int show_manpage(const char *pager, char *man_filename, int man, int leve
 #endif
 #if ENABLE_FEATURE_SEAMLESS_XZ
        strcpy(ext, "xz");
-       if (run_pipe(pager, man_filename, man, level))
+       if (run_pipe(pager, filename_with_zext, man, level))
                return 1;
 #endif
 #if ENABLE_FEATURE_SEAMLESS_BZ2
        strcpy(ext, "bz2");
-       if (run_pipe(pager, man_filename, man, level))
+       if (run_pipe(pager, filename_with_zext, man, level))
                return 1;
 #endif
 #if ENABLE_FEATURE_SEAMLESS_GZ
        strcpy(ext, "gz");
-       if (run_pipe(pager, man_filename, man, level))
+       if (run_pipe(pager, filename_with_zext, man, level))
                return 1;
 #endif
 
-#if SEAMLESS_COMPRESSION
-       ext[-1] = '\0';
-#endif
-       if (run_pipe(pager, man_filename, man, level))
-               return 1;
+       return run_pipe(pager, man_filename, man, level);
+}
 
-       return 0;
+static char **add_MANPATH(char **man_path_list, int *count_mp, char *path)
+{
+       if (path) while (*path) {
+               char *next_path;
+               char **path_element;
+
+               next_path = strchr(path, ':');
+               if (next_path) {
+                       if (next_path == path) /* "::"? */
+                               goto next;
+                       *next_path = '\0';
+               }
+               /* Do we already have path? */
+               path_element = man_path_list;
+               if (path_element) while (*path_element) {
+                       if (strcmp(*path_element, path) == 0)
+                               goto skip;
+                       path_element++;
+               }
+               man_path_list = xrealloc_vector(man_path_list, 4, *count_mp);
+               man_path_list[*count_mp] = xstrdup(path);
+               (*count_mp)++;
+               /* man_path_list is NULL terminated */
+               /* man_path_list[*count_mp] = NULL; - xrealloc_vector did it */
+ skip:
+               if (!next_path)
+                       break;
+               /* "path" may be a result of getenv(), be nice and don't mangle it */
+               *next_path = ':';
+ next:
+               path = next_path + 1;
+       }
+       return man_path_list;
 }
 
 int man_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int man_main(int argc UNUSED_PARAM, char **argv)
 {
        parser_t *parser;
-       const char *pager;
-       char **man_path_list;
+       const char *pager = ENABLE_LESS ? "less" : "more";
        char *sec_list;
        char *cur_path, *cur_sect;
-       int count_mp, cur_mp;
+       char **man_path_list;
+       int count_mp;
+       int cur_mp;
        int opt, not_found;
        char *token[2];
 
@@ -168,20 +199,20 @@ int man_main(int argc UNUSED_PARAM, char **argv)
        opt = getopt32(argv, "+aw");
        argv += optind;
 
-       sec_list = xstrdup("1:2:3:4:5:6:7:8:9");
-       /* Last valid man_path_list[] is [0x10] */
+       sec_list = xstrdup("0p:1:1p:2:3:3p:4:5:6:7:8:9");
+
        count_mp = 0;
-       man_path_list = xzalloc(0x11 * sizeof(man_path_list[0]));
-       man_path_list[0] = getenv("MANPATH");
-       if (!man_path_list[0]) /* default, may be overridden by /etc/man.conf */
+       man_path_list = add_MANPATH(NULL, &count_mp,
+                       getenv("MANDATORY_MANPATH"+10) /* "MANPATH" */
+       );
+       if (!man_path_list) {
+               /* default, may be overridden by /etc/man.conf */
+               man_path_list = xzalloc(2 * sizeof(man_path_list[0]));
                man_path_list[0] = (char*)"/usr/man";
-       else
-               count_mp++;
-       pager = getenv("MANPAGER");
-       if (!pager) {
-               pager = getenv("PAGER");
-               if (!pager)
-                       pager = "more";
+               /* count_mp stays 0.
+                * Thus, man.conf will overwrite man_path_list[0]
+                * if a path is defined there.
+                */
        }
 
        /* Parse man.conf[ig] or man_db.conf */
@@ -196,38 +227,15 @@ int man_main(int argc UNUSED_PARAM, char **argv)
        while (config_read(parser, token, 2, 0, "# \t", PARSE_NORMAL)) {
                if (!token[1])
                        continue;
+               if (strcmp("DEFINE", token[0]) == 0) {
+                       if (is_prefixed_with("pager", token[1])) {
+                               pager = xstrdup(skip_whitespace(token[1]) + 5);
+                       }
+               } else
                if (strcmp("MANDATORY_MANPATH"+10, token[0]) == 0 /* "MANPATH"? */
                 || strcmp("MANDATORY_MANPATH", token[0]) == 0
                ) {
-                       char *path = token[1];
-                       while (*path) {
-                               char *next_path;
-                               char **path_element;
-
-                               next_path = strchr(path, ':');
-                               if (next_path) {
-                                       *next_path = '\0';
-                                       if (next_path++ == path) /* "::"? */
-                                               goto next;
-                               }
-                               /* Do we already have path? */
-                               path_element = man_path_list;
-                               while (*path_element) {
-                                       if (strcmp(*path_element, path) == 0)
-                                               goto skip;
-                                       path_element++;
-                               }
-                               man_path_list = xrealloc_vector(man_path_list, 4, count_mp);
-                               man_path_list[count_mp] = xstrdup(path);
-                               count_mp++;
-                               /* man_path_list is NULL terminated */
-                               /*man_path_list[count_mp] = NULL; - xrealloc_vector did it */
- skip:
-                               if (!next_path)
-                                       break;
- next:
-                               path = next_path;
-                       }
+                       man_path_list = add_MANPATH(man_path_list, &count_mp, token[1]);
                }
                if (strcmp("MANSECT", token[0]) == 0) {
                        free(sec_list);
@@ -236,6 +244,15 @@ int man_main(int argc UNUSED_PARAM, char **argv)
        }
        config_close(parser);
 
+       {
+               /* environment overrides setting from man.config */
+               char *env_pager = getenv("MANPAGER");
+               if (!env_pager)
+                       env_pager = getenv("PAGER");
+               if (env_pager)
+                       pager = env_pager;
+       }
+
        not_found = 0;
        do { /* for each argv[] */
                int found = 0;