man: new applet. ~600 bytes.

diff --git a/include/applets.h b/include/applets.h
index 2e661aca080c220cbfa8930299cfb076d5c0cfbe..2bd70f281917efbba06b1ce823625de9b363cb3c 100644 (file)
--- a/include/applets.h
+++ b/include/applets.h
@@ -237,6 +237,7 @@ USE_LSATTR(APPLET(lsattr, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_LSMOD(APPLET(lsmod, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_UNLZMA(APPLET_ODDNAME(lzmacat, unlzma, _BB_DIR_USR_BIN, _BB_SUID_NEVER, lzmacat))
 USE_MAKEDEVS(APPLET(makedevs, _BB_DIR_SBIN, _BB_SUID_NEVER))
+USE_MAN(APPLET(man, _BB_DIR_SBIN, _BB_SUID_NEVER)) 
 USE_MATCHPATHCON(APPLET(matchpathcon, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_MD5SUM(APPLET_ODDNAME(md5sum, md5_sha1_sum, _BB_DIR_USR_BIN, _BB_SUID_NEVER, md5sum))
 USE_MDEV(APPLET(mdev, _BB_DIR_SBIN, _BB_SUID_NEVER))

diff --git a/include/usage.h b/include/usage.h
index dbe403d1361b603b2d623eb411bf51ef846e4ad4..d1847020b3894cbd28a2ed0d8eb3b791a8603579 100644 (file)
--- a/include/usage.h
+++ b/include/usage.h
@@ -2300,6 +2300,14 @@
        "/dev/hda[0-15]\n"
 #endif
 
+#define man_trivial_usage \
+       "[OPTION]... [MANPAGE]..."
+#define man_full_usage \
+       "Format and display manual page\n" \
+     "\nOptions:" \
+     "\n       -a      Display all pages" \
+     "\n       -w      Show page locations" \
+
 #define matchpathcon_trivial_usage \
        "[-n] [-N] [-f file_contexts_file] [-p prefix] [-V]"
 #define matchpathcon_full_usage \

diff --git a/miscutils/Config.in b/miscutils/Config.in
index c6c1490df2c5cadd6bc0faded39d6addaa394621..06cac14ab971f61d61bf995c0e0a2625ab3a23fe 100644 (file)
--- a/miscutils/Config.in
+++ b/miscutils/Config.in
@@ -372,6 +372,12 @@ config FEATURE_MAKEDEVS_TABLE
 
 endchoice
 
+config MAN
+       bool "man"
+       default n
+       help
+         Format and display manual pages.
+
 config MICROCOM
        bool "microcom"
        default n

diff --git a/miscutils/Kbuild b/miscutils/Kbuild
index 513c038822dd502640e9b1c6b4cf9270821930f5..ba2a0dc148dd4bc3d90eac48493ff8cff9741a28 100644 (file)
--- a/miscutils/Kbuild
+++ b/miscutils/Kbuild
@@ -19,6 +19,7 @@ lib-$(CONFIG_HDPARM)      += hdparm.o
 lib-$(CONFIG_LAST)        += last.o
 lib-$(CONFIG_LESS)        += less.o
 lib-$(CONFIG_MAKEDEVS)    += makedevs.o
+lib-$(CONFIG_MAN)         += man.o
 lib-$(CONFIG_MICROCOM)    += microcom.o
 lib-$(CONFIG_MOUNTPOINT)  += mountpoint.o
 lib-$(CONFIG_MT)          += mt.o

diff --git a/miscutils/man.c b/miscutils/man.c
new file mode 100644 (file)
index 0000000..ed31b66
--- /dev/null
+++ b/miscutils/man.c
@@ -0,0 +1,151 @@
+/* mini man implementation for busybox
+ * Copyright (C) 2008 Denys Vlasenko <vda.linux@googlemail.com>
+ * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+
+enum {
+       OPT_a = 1, /* all */
+       OPT_w = 2, /* print path */
+};
+
+/* This is what I see on my desktop system deing executed:
+
+(
+echo ".ll 12.4i"
+echo ".nr LL 12.4i"
+echo ".pl 1100i"
+gunzip -c '/usr/man/man1/bzip2.1.gz'
+echo ".\\\""
+echo ".pl \n(nlu+10"
+) | gtbl | nroff -Tlatin1 -mandoc | less
+
+*/
+
+static int run_pipe(const char *unpacker, const char *pager, char *man_filename)
+{
+       char *cmd;
+
+       if (access(man_filename, R_OK) != 0)
+               return 0;
+
+       if (option_mask32 & OPT_w) {
+               puts(man_filename);
+               return 1;
+       }
+
+       cmd = xasprintf("%s '%s' | gtbl | nroff -Tlatin1 -mandoc | %s",
+                       unpacker, man_filename, pager);
+       system(cmd);
+       free(cmd);
+       return 1;
+}
+
+/* man_filename is of the form "/dir/dir/dir/name.s.bz2" */
+static int show_manpage(const char *pager, char *man_filename)
+{
+       int len;
+
+       if (run_pipe("bunzip2 -c", pager, man_filename))
+               return 1;
+
+       len = strlen(man_filename) - 1;
+
+       man_filename[len] = '\0'; /* ".bz2" -> ".gz" */
+       man_filename[len - 2] = 'g';
+       if (run_pipe("gunzip -c", pager, man_filename))
+               return 1;
+
+       man_filename[len - 3] = '\0'; /* ".gz" -> "" */
+       if (run_pipe("cat", pager, man_filename))
+               return 1;
+
+       return 0;
+}
+
+int man_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int man_main(int argc ATTRIBUTE_UNUSED, char **argv)
+{
+       FILE *cf;
+       const char *pager;
+       char *man_path, *sec_list;
+       char *cur_path, *cur_sect;
+       char *line, *value;
+       int opt;
+
+       opt_complementary = "-1"; /* at least one argument */
+       opt = getopt32(argv, "+aw");
+       argv += optind;
+
+       sec_list = xstrdup("1:2:3:4:5:6:7:8:9");
+       man_path = xstrdup(getenv("MANPATH"));
+       pager = getenv("MANPAGER");
+       if (!pager) {
+               pager = getenv("PAGER");
+               if (!pager)
+                       pager = "more";
+       }
+
+       /* Parse man.conf */
+       cf = fopen_or_warn("/etc/man.conf", "r");
+       if (cf) {
+               /* go through man configuration file and search relevant paths, sections */
+               while ((line = xmalloc_fgetline(cf)) != NULL) {
+                       trim(line); /* remove whitespace at the beginning/end */
+                       if (isspace(line[7])) {
+                               line[7] = '\0';
+                               value = skip_whitespace(&line[8]);
+                               *skip_non_whitespace(value) = '\0';
+                               if (strcmp("MANPATH", line) == 0) {
+                                       free(man_path);
+                                               man_path = xstrdup(value);
+                               }
+                               if (strcmp("MANSECT", line) == 0) {
+                                       free(sec_list);
+                                       sec_list = xstrdup(value);
+                               }
+                       }
+                       free(line);
+               }
+               fclose(cf);
+       }
+
+       do { /* for each argv[] */
+               cur_path = man_path;
+               do { /* for each MANPATH item */
+                       char *next_path = strchrnul(cur_path, ':');
+                       int path_len = next_path - cur_path;
+
+                       cur_sect = sec_list;
+                       do { /* for each section */
+                               char *next_sect = strchrnul(cur_sect, ':');
+                               int sect_len = next_sect - cur_sect;
+
+                               char *man_filename = xasprintf("%.*s/man%.*s/%s.%.*s" ".bz2",
+                                                       path_len, cur_path,
+                                                       sect_len, cur_sect,
+                                                       *argv,
+                                                       sect_len, cur_sect);
+                               if (show_manpage(pager, man_filename)) {
+                                       if (!(opt & OPT_a)) {
+                                               goto next_arg;
+                                       }
+                               }
+                               free(man_filename);
+
+                               cur_sect = next_sect;
+                               while (*cur_sect == ':')
+                                       cur_sect++;
+                       } while (*cur_sect);
+
+                       cur_path = next_path;
+                       while (*cur_path == ':')
+                               cur_path++;
+               } while (*cur_path);
+ next_arg:
+               argv++;
+       } while (*argv);
+
+       return EXIT_SUCCESS;
+}