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| 1 | |
| 2 | #include <stdio.h> // for fprintf |
| 3 | #include <stdlib.h> // for getenv |
| 4 | #include <unistd.h> // for access |
| 5 | |
| 6 | |
| 7 | typedef int bool; |
| 8 | #define FALSE 0 |
| 9 | #define TRUE 1 |
| 10 | |
| 11 | #define LENGTH_OF(a) ( sizeof(a) / sizeof(a[0]) ) |
| 12 | |
| 13 | |
| 14 | #define ANY_SECTION 0 |
| 15 | |
| 16 | |
| 17 | // This is for different forms that man page file names can take such as: |
| 18 | // + time.2 |
| 19 | // + time.2.gz |
| 20 | // |
| 21 | typedef struct |
| 22 | { |
| 23 | char *name_template; |
| 24 | char *emitter; |
| 25 | } |
| 26 | Form; |
| 27 | |
| 28 | |
| 29 | int main( int argc, char **argv) |
| 30 | { |
| 31 | // Parse the command-line |
| 32 | if ( argc < 2 || 3 < argc) |
| 33 | { |
| 34 | fprintf( stderr, "Use: %s [section] page\n", argv[0]); |
| 35 | return 1; |
| 36 | } |
| 37 | |
| 38 | int section; |
| 39 | char *page; |
| 40 | |
| 41 | if ( 2 == argc) |
| 42 | { |
| 43 | page = argv[ 1]; |
| 44 | section = ANY_SECTION; |
| 45 | } |
| 46 | else { |
| 47 | section = atoi( argv[1]); |
| 48 | page = argv[ 2]; |
| 49 | } |
| 50 | |
| 51 | // Parse the MANPATH |
| 52 | char *man_path_s = getenv("MANPATH"); |
| 53 | if ( ! man_path_s) |
| 54 | man_path_s = "/usr/share/man"; |
| 55 | #define MAX_MAN_PATH_ITEMS 32 |
| 56 | char *man_path_item[ MAX_MAN_PATH_ITEMS]; |
| 57 | int man_path_items = 0; |
| 58 | // Split the colon separated MANPATH in to discrete strings |
| 59 | char *cursor = man_path_s; |
| 60 | bool fresh_item = TRUE; |
| 61 | while( *cursor != '\0') |
| 62 | { |
| 63 | if ( fresh_item) |
| 64 | { |
| 65 | if ( man_path_items < MAX_MAN_PATH_ITEMS) |
| 66 | man_path_item[ man_path_items++] = cursor; |
| 67 | fresh_item = FALSE; |
| 68 | } |
| 69 | if ( ':' == *cursor) |
| 70 | { |
| 71 | *cursor = '\0'; |
| 72 | fresh_item = TRUE; |
| 73 | } |
| 74 | cursor += 1; |
| 75 | } |
| 76 | |
| 77 | // Go through every item on MANPATH |
| 78 | int mpi; |
| 79 | for ( mpi = 0; mpi < man_path_items; ++ mpi) |
| 80 | { |
| 81 | char *man_dir = man_path_item[ mpi]; |
| 82 | |
| 83 | // Go through sections 1..9 or just the specified section |
| 84 | int min_s = ANY_SECTION == section ? 1 : section; |
| 85 | int max_s = ANY_SECTION == section ? 9 : section; |
| 86 | int s; |
| 87 | for ( s = min_s; s <= max_s; ++ s) |
| 88 | { |
| 89 | // If the named man page exists in this (MANPATH item, section) then |
| 90 | // display it |
| 91 | char path_to_file[ 256]; |
| 92 | Form form[] = { |
| 93 | {"%s/man%i/%s.%i", emitter:"cat"}, |
| 94 | {"%s/man%i/%s.%i.gz", emitter:"zcat"}, |
| 95 | }; |
| 96 | char cmd[ 512] = {'\0'}; |
| 97 | int i; |
| 98 | for ( i = 0; i < LENGTH_OF(form); ++ i) |
| 99 | { |
| 100 | Form f = form[ i]; |
| 101 | |
| 102 | snprintf( path_to_file, sizeof(path_to_file), f.name_template, man_dir, s, page, s); |
| 103 | if ( ! access( path_to_file, R_OK)) |
| 104 | { |
| 105 | snprintf( cmd, sizeof(cmd), "%s %s | mandoc | less", f.emitter, path_to_file); |
| 106 | break; |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | if ( cmd[0] != '\0') |
| 111 | { |
| 112 | system( cmd); |
| 113 | return 0; |
| 114 | } |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | fprintf( stderr, "No manual entry for %s\n", page); |
| 119 | return 1; |
| 120 | } |
| 121 | |
| 122 |
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