man: new applet. ~600 bytes.

author: Denis Vlasenko <vda.linux@googlemail.com> 2008-04-13 08:20:00 +0000
committer: Denis Vlasenko <vda.linux@googlemail.com> 2008-04-13 08:20:00 +0000
commit: ffa4499c9f55e652e71acd0c4e5e9412ede37050 (patch)
tree: 04379edd4447d751c08c5104ba45d5f21fd8ec2c /miscutils/man.c
parent: 867bd37c7f9f87d622047a2076c9a78c08f71b30 (diff)
download: busybox-w32-ffa4499c9f55e652e71acd0c4e5e9412ede37050.tar.gz
busybox-w32-ffa4499c9f55e652e71acd0c4e5e9412ede37050.tar.bz2
busybox-w32-ffa4499c9f55e652e71acd0c4e5e9412ede37050.zip
1 files changed, 151 insertions, 0 deletions
diff --git a/miscutils/man.c b/miscutils/man.c
new file mode 100644
index 000000000..ed31b66c7
--- /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;
+}
author	Denis Vlasenko <vda.linux@googlemail.com>	2008-04-13 08:20:00 +0000
committer	Denis Vlasenko <vda.linux@googlemail.com>	2008-04-13 08:20:00 +0000
commit	ffa4499c9f55e652e71acd0c4e5e9412ede37050 (patch)
tree	04379edd4447d751c08c5104ba45d5f21fd8ec2c /miscutils/man.c
parent	867bd37c7f9f87d622047a2076c9a78c08f71b30 (diff)
download	busybox-w32-ffa4499c9f55e652e71acd0c4e5e9412ede37050.tar.gz busybox-w32-ffa4499c9f55e652e71acd0c4e5e9412ede37050.tar.bz2 busybox-w32-ffa4499c9f55e652e71acd0c4e5e9412ede37050.zip

diff --git a/miscutils/man.c b/miscutils/man.c new file mode 100644 index 000000000..ed31b66c7 --- /dev/null +++ b/miscutils/man.c
@@ -0,0 +1,151 @@
	1	/* mini man implementation for busybox
	2	* Copyright (C) 2008 Denys Vlasenko <vda.linux@googlemail.com>
	3	* Licensed under GPLv2, see file LICENSE in this tarball for details.
	4	*/
	5
	6	#include "libbb.h"
	7
	8	enum {
	9	OPT_a = 1, /* all */
	10	OPT_w = 2, /* print path */
	11	};
	12
	13	/* This is what I see on my desktop system deing executed:
	14
	15	(
	16	echo ".ll 12.4i"
	17	echo ".nr LL 12.4i"
	18	echo ".pl 1100i"
	19	gunzip -c '/usr/man/man1/bzip2.1.gz'
	20	echo ".\\\""
	21	echo ".pl \n(nlu+10"
	22	) \| gtbl \| nroff -Tlatin1 -mandoc \| less
	23
	24	*/
	25
	26	static int run_pipe(const char unpacker, const char pager, char *man_filename)
	27	{
	28	char *cmd;
	29
	30	if (access(man_filename, R_OK) != 0)
	31	return 0;
	32
	33	if (option_mask32 & OPT_w) {
	34	puts(man_filename);
	35	return 1;
	36	}
	37
	38	cmd = xasprintf("%s '%s' \| gtbl \| nroff -Tlatin1 -mandoc \| %s",
	39	unpacker, man_filename, pager);
	40	system(cmd);
	41	free(cmd);
	42	return 1;
	43	}
	44
	45	/* man_filename is of the form "/dir/dir/dir/name.s.bz2" */
	46	static int show_manpage(const char pager, char man_filename)
	47	{
	48	int len;
	49
	50	if (run_pipe("bunzip2 -c", pager, man_filename))
	51	return 1;
	52
	53	len = strlen(man_filename) - 1;
	54
	55	man_filename[len] = '\0'; /* ".bz2" -> ".gz" */
	56	man_filename[len - 2] = 'g';
	57	if (run_pipe("gunzip -c", pager, man_filename))
	58	return 1;
	59
	60	man_filename[len - 3] = '\0'; /* ".gz" -> "" */
	61	if (run_pipe("cat", pager, man_filename))
	62	return 1;
	63
	64	return 0;
	65	}
	66
	67	int man_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
	68	int man_main(int argc ATTRIBUTE_UNUSED, char **argv)
	69	{
	70	FILE *cf;
	71	const char *pager;
	72	char man_path, sec_list;
	73	char cur_path, cur_sect;
	74	char line, value;
	75	int opt;
	76
	77	opt_complementary = "-1"; /* at least one argument */
	78	opt = getopt32(argv, "+aw");
	79	argv += optind;
	80
	81	sec_list = xstrdup("1:2:3:4:5:6:7:8:9");
	82	man_path = xstrdup(getenv("MANPATH"));
	83	pager = getenv("MANPAGER");
	84	if (!pager) {
	85	pager = getenv("PAGER");
	86	if (!pager)
	87	pager = "more";
	88	}
	89
	90	/* Parse man.conf */
	91	cf = fopen_or_warn("/etc/man.conf", "r");
	92	if (cf) {
	93	/* go through man configuration file and search relevant paths, sections */
	94	while ((line = xmalloc_fgetline(cf)) != NULL) {
	95	trim(line); /* remove whitespace at the beginning/end */
	96	if (isspace(line[7])) {
	97	line[7] = '\0';
	98	value = skip_whitespace(&line[8]);
	99	*skip_non_whitespace(value) = '\0';
	100	if (strcmp("MANPATH", line) == 0) {
	101	free(man_path);
	102	man_path = xstrdup(value);
	103	}
	104	if (strcmp("MANSECT", line) == 0) {
	105	free(sec_list);
	106	sec_list = xstrdup(value);
	107	}
	108	}
	109	free(line);
	110	}
	111	fclose(cf);
	112	}
	113
	114	do { /* for each argv[] */
	115	cur_path = man_path;
	116	do { /* for each MANPATH item */
	117	char *next_path = strchrnul(cur_path, ':');
	118	int path_len = next_path - cur_path;
	119
	120	cur_sect = sec_list;
	121	do { /* for each section */
	122	char *next_sect = strchrnul(cur_sect, ':');
	123	int sect_len = next_sect - cur_sect;
	124
	125	char man_filename = xasprintf("%.s/man%.s/%s.%.s" ".bz2",
	126	path_len, cur_path,
	127	sect_len, cur_sect,
	128	*argv,
	129	sect_len, cur_sect);
	130	if (show_manpage(pager, man_filename)) {
	131	if (!(opt & OPT_a)) {
	132	goto next_arg;
	133	}
	134	}
	135	free(man_filename);
	136
	137	cur_sect = next_sect;
	138	while (*cur_sect == ':')
	139	cur_sect++;
	140	} while (*cur_sect);
	141
	142	cur_path = next_path;
	143	while (*cur_path == ':')
	144	cur_path++;
	145	} while (*cur_path);
	146	next_arg:
	147	argv++;
	148	} while (*argv);
	149
	150	return EXIT_SUCCESS;
	151	}