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authorDenis Vlasenko <vda.linux@googlemail.com>2008-08-05 13:16:18 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2008-08-05 13:16:18 +0000
commit540baf646a526a68aeb83a3c6da706a2f2a1aeb2 (patch)
treea00104b18b3d45e620df9d9d3ef215b0ed89c18d /miscutils/man.c
parente9ad84dfd4c7eb2936374f02989dacf7026a7276 (diff)
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man: add handling of "man links", by Ivana Varekova <varekova AT redhat.com>
function old new delta run_pipe 102 354 +252 show_manpage - 126 +126 man_main 705 615 -90 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 1/1 up/down: 378/-90) Total: 288 bytes
Diffstat (limited to 'miscutils/man.c')
-rw-r--r--miscutils/man.c73
1 files changed, 62 insertions, 11 deletions
diff --git a/miscutils/man.c b/miscutils/man.c
index f499fef62..91b995cf4 100644
--- a/miscutils/man.c
+++ b/miscutils/man.c
@@ -27,10 +27,19 @@ echo ".pl \n(nlu+10"
27#define STR_catNULmanNUL "cat\0man" 27#define STR_catNULmanNUL "cat\0man"
28#define STR_cat "cat\0man" 28#define STR_cat "cat\0man"
29 29
30static int run_pipe(const char *unpacker, const char *pager, char *man_filename, int man) 30//TODO: make gz/bz2 support conditional on FEATURE_SEAMLESS_GZ/BZ2,
31// add SEAMLESS_LZMA support
32
33static int show_manpage(const char *pager, char *man_filename, int man, int level);
34
35static int run_pipe(const char *unpacker, const char *pager, char *man_filename, int man, int level)
31{ 36{
32 char *cmd; 37 char *cmd;
33 38
39 /* Prevent man page link loops */
40 if (level > 10)
41 return 0;
42
34 if (access(man_filename, R_OK) != 0) 43 if (access(man_filename, R_OK) != 0)
35 return 0; 44 return 0;
36 45
@@ -39,6 +48,53 @@ static int run_pipe(const char *unpacker, const char *pager, char *man_filename,
39 return 1; 48 return 1;
40 } 49 }
41 50
51 if (man) { /* man page, not cat page */
52 /* Test whether the man page is not a link to another one. */
53 /* The link has the following on the first line: */
54 /* ".so another_man_page" */
55 struct stat sb;
56 char *line;
57 char *linkname, *p;
58
59 /* On my system:
60 * man1/genhostid.1.gz: 203 bytes - smallest real manpage
61 * man2/path_resolution.2.gz: 114 bytes - largest link
62 */
63 xstat(man_filename, &sb);
64 if (sb.st_size > 300) /* err on the safe side */
65 goto ordinary_manpage;
66
67 line = xmalloc_open_zipped_read_close(man_filename, NULL);
68 if (!line || strncmp(line, ".so ", 4) != 0) {
69 free(line);
70 goto ordinary_manpage;
71 }
72 /* Example: man2/path_resolution.2.gz contains
73 * ".so man7/path_resolution.7\n<junk>"
74 */
75 *strchrnul(line, '\n') = '\0';
76 linkname = p = skip_whitespace(&line[4]);
77 while (1) {
78 char *newname_slash, *oldname_slash;
79
80 oldname_slash = strrchr(man_filename, '/');
81 if (!oldname_slash)
82 goto ordinary_manpage;
83 *oldname_slash = '\0';
84 newname_slash = strchr(p, '/');
85 if (!newname_slash)
86 break;
87 p = newname_slash + 1;
88 }
89 man_filename = xasprintf("%s/%s" ".bz2", man_filename, linkname);
90 free(line);
91 /* Note: we leak "new" man_filename string as well... */
92 if (show_manpage(pager, man_filename, man, level + 1))
93 return 1;
94 /* else: show the link, it's better than nothing */
95 }
96
97 ordinary_manpage:
42 /* "2>&1" is added so that nroff errors are shown in pager too. 98 /* "2>&1" is added so that nroff errors are shown in pager too.
43 * Otherwise it may show just empty screen */ 99 * Otherwise it may show just empty screen */
44 cmd = xasprintf( 100 cmd = xasprintf(
@@ -51,22 +107,22 @@ static int run_pipe(const char *unpacker, const char *pager, char *man_filename,
51} 107}
52 108
53/* man_filename is of the form "/dir/dir/dir/name.s.bz2" */ 109/* man_filename is of the form "/dir/dir/dir/name.s.bz2" */
54static int show_manpage(const char *pager, char *man_filename, int man) 110static int show_manpage(const char *pager, char *man_filename, int man, int level)
55{ 111{
56 int len; 112 int len;
57 113
58 if (run_pipe("bunzip2 -c", pager, man_filename, man)) 114 if (run_pipe("bunzip2 -c", pager, man_filename, man, level))
59 return 1; 115 return 1;
60 116
61 len = strlen(man_filename) - 1; 117 len = strlen(man_filename) - 1;
62 118
63 man_filename[len] = '\0'; /* ".bz2" -> ".gz" */ 119 man_filename[len] = '\0'; /* ".bz2" -> ".gz" */
64 man_filename[len - 2] = 'g'; 120 man_filename[len - 2] = 'g';
65 if (run_pipe("gunzip -c", pager, man_filename, man)) 121 if (run_pipe("gunzip -c", pager, man_filename, man, level))
66 return 1; 122 return 1;
67 123
68 man_filename[len - 3] = '\0'; /* ".gz" -> "" */ 124 man_filename[len - 3] = '\0'; /* ".gz" -> "" */
69 if (run_pipe(STR_cat, pager, man_filename, man)) 125 if (run_pipe(STR_cat, pager, man_filename, man, level))
70 return 1; 126 return 1;
71 127
72 return 0; 128 return 0;
@@ -121,11 +177,6 @@ int man_main(int argc UNUSED_PARAM, char **argv)
121 } 177 }
122 config_close(parser); 178 config_close(parser);
123 179
124// TODO: my man3/getpwuid.3.gz contains just one line:
125// .so man3/getpwnam.3
126// (and I _dont_ have man3/getpwnam.3, I have man3/getpwnam.3.gz)
127// need to support this...
128
129 not_found = 0; 180 not_found = 0;
130 do { /* for each argv[] */ 181 do { /* for each argv[] */
131 int found = 0; 182 int found = 0;
@@ -151,7 +202,7 @@ int man_main(int argc UNUSED_PARAM, char **argv)
151 sect_len, cur_sect, 202 sect_len, cur_sect,
152 *argv, 203 *argv,
153 sect_len, cur_sect); 204 sect_len, cur_sect);
154 found_here = show_manpage(pager, man_filename, cat0man1); 205 found_here = show_manpage(pager, man_filename, cat0man1, 0);
155 found |= found_here; 206 found |= found_here;
156 cat0man1 += found_here + 1; 207 cat0man1 += found_here + 1;
157 free(man_filename); 208 free(man_filename);
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-03-17 03:27:21 +0000