| 1 | /* config_read(), _delete(), _length() - Generic config file routines.
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| 2 | * Author: Kees J. Bot
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| 3 | * 5 Jun 1999
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| 4 | */
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| 5 | #define nil ((void*)0)
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| 6 | #if __minix_vmd
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| 7 | #include <minix/stubs.h>
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| 8 | #else
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| 9 | #define fstat _fstat
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| 10 | #define stat _stat
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| 11 | #endif
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| 12 | #include <sys/types.h>
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| 13 | #include <stdio.h>
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| 14 | #include <stddef.h>
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| 15 | #include <stdlib.h>
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| 16 | #include <errno.h>
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| 17 | #include <string.h>
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| 18 | #include <time.h>
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| 19 | #include <sys/stat.h>
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| 20 | #if __minix_vmd
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| 21 | #include <minix/asciictype.h>
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| 22 | #else
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| 23 | #include <ctype.h>
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| 24 | #endif
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| 25 | #define _c /* not const */
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| 26 | #include <configfile.h>
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| 27 |
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| 28 | typedef struct configfile { /* List of (included) configuration files. */
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| 29 | struct configfile *next; /* A list indeed. */
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| 30 | time_t ctime; /* Last changed time, -1 if no file. */
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| 31 | char name[1]; /* File name. */
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| 32 | } configfile_t;
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| 33 |
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| 34 | /* Size of a configfile_t given a file name of length 'len'. */
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| 35 | #define configfilesize(len) (offsetof(configfile_t, name) + 1 + (len))
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| 36 |
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| 37 | typedef struct firstconfig { /* First file and first word share a slot. */
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| 38 | configfile_t *filelist;
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| 39 | char new; /* Set when created. */
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| 40 | config_t config1;
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| 41 | } firstconfig_t;
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| 42 |
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| 43 | /* Size of a config_t given a word of lenght 'len'. Same for firstconfig_t. */
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| 44 | #define config0size() (offsetof(config_t, word))
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| 45 | #define configsize(len) (config0size() + 1 + (len))
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| 46 | #define firstconfigsize(len) \
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| 47 | (offsetof(firstconfig_t, config1) + configsize(len))
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| 48 |
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| 49 | /* Translate address of first config word to enclosing firstconfig_t and vv. */
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| 50 | #define cfg2fcfg(p) \
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| 51 | ((firstconfig_t *) ((char *) (p) - offsetof(firstconfig_t, config1)))
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| 52 | #define fcfg2cfg(p) (&(p)->config1)
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| 53 |
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| 54 | /* Variables used while building data. */
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| 55 | static configfile_t *c_files; /* List of (included) config files. */
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| 56 | static int c_flags; /* Flags argument of config_read(). */
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| 57 | static FILE *c_fp; /* Current open file. */
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| 58 | static char *c_file; /* Current open file name. */
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| 59 | static unsigned c_line; /* Current line number. */
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| 60 | static int c; /* Next character. */
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| 61 |
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| 62 | static void *allocate(void *mem, size_t size)
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| 63 | /* Like realloc(), but checked. */
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| 64 | {
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| 65 | if ((mem= realloc(mem, size)) == nil) {
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| 66 | fprintf(stderr, "\"%s\", line %u: Out of memory\n", c_file, c_line);
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| 67 | exit(1);
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| 68 | }
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| 69 | return mem;
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| 70 | }
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| 71 |
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| 72 | #define deallocate(mem) free(mem)
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| 73 |
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| 74 | static void delete_filelist(configfile_t *cfgf)
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| 75 | /* Delete configuration file list. */
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| 76 | {
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| 77 | void *junk;
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| 78 |
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| 79 | while (cfgf != nil) {
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| 80 | junk= cfgf;
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| 81 | cfgf= cfgf->next;
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| 82 | deallocate(junk);
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| 83 | }
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| 84 | }
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| 85 |
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| 86 | static void delete_config(config_t *cfg)
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| 87 | /* Delete configuration file data. */
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| 88 | {
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| 89 | config_t *next, *list, *junk;
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| 90 |
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| 91 | next= cfg;
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| 92 | list= nil;
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| 93 | for (;;) {
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| 94 | if (next != nil) {
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| 95 | /* Push the 'next' chain in reverse on the 'list' chain, putting
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| 96 | * a leaf cell (next == nil) on top of 'list'.
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| 97 | */
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| 98 | junk= next;
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| 99 | next= next->next;
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| 100 | junk->next= list;
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| 101 | list= junk;
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| 102 | } else
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| 103 | if (list != nil) {
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| 104 | /* Delete the leaf cell. If it has a sublist then that becomes
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| 105 | * the 'next' chain.
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| 106 | */
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| 107 | junk= list;
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| 108 | next= list->list;
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| 109 | list= list->next;
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| 110 | deallocate(junk);
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| 111 | } else {
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| 112 | /* Both chains are gone. */
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| 113 | break;
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| 114 | }
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| 115 | }
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| 116 | }
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| 117 |
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| 118 | void config_delete(config_t *cfg1)
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| 119 | /* Delete configuration file data, being careful with the odd first one. */
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| 120 | {
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| 121 | firstconfig_t *fcfg= cfg2fcfg(cfg1);
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| 122 |
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| 123 | delete_filelist(fcfg->filelist);
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| 124 | delete_config(fcfg->config1.next);
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| 125 | delete_config(fcfg->config1.list);
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| 126 | deallocate(fcfg);
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| 127 | }
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| 128 |
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| 129 | static void nextc(void)
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| 130 | /* Read the next character of the current file into 'c'. */
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| 131 | {
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| 132 | if (c == '\n') c_line++;
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| 133 | c= getc(c_fp);
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| 134 | if (c == EOF && ferror(c_fp)) {
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| 135 | fprintf(stderr, "\"%s\", line %u: %s\n",
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| 136 | c_file, c_line, strerror(errno));
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| 137 | exit(1);
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| 138 | }
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| 139 | }
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| 140 |
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| 141 | static void skipwhite(void)
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| 142 | /* Skip whitespace and comments. */
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| 143 | {
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| 144 | while (isspace(c)) {
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| 145 | nextc();
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| 146 | if (c == '#') {
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| 147 | do nextc(); while (c != EOF && c != '\n');
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| 148 | }
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| 149 | }
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| 150 | }
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| 151 |
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| 152 | static void parse_err(void)
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| 153 | /* Tell user that you can't parse past the current character. */
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| 154 | {
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| 155 | char sc[2];
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| 156 |
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| 157 | sc[0]= c;
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| 158 | sc[1]= 0;
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| 159 | fprintf(stderr, "\"%s\", line %u: parse error at '%s'\n",
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| 160 | c_file, c_line, c == EOF ? "EOF" : sc);
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| 161 | exit(1);
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| 162 | }
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| 163 |
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| 164 | static config_t *read_word(void)
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| 165 | /* Read a word or string. */
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| 166 | {
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| 167 | config_t *w;
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| 168 | size_t i, len;
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| 169 | int q;
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| 170 | static char SPECIAL[] = "!#$%&*+-./:<=>?[\\]^_|~";
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| 171 |
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| 172 | i= 0;
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| 173 | len= 32;
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| 174 | w= allocate(nil, configsize(32));
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| 175 | w->next= nil;
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| 176 | w->list= nil;
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| 177 | w->file= c_file;
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| 178 | w->line= c_line;
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| 179 | w->flags= 0;
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| 180 |
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| 181 | /* Is it a quoted string? */
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| 182 | if (c == '\'' || c == '"') {
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| 183 | q= c; /* yes */
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| 184 | nextc();
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| 185 | } else {
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| 186 | q= -1; /* no */
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| 187 | }
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| 188 |
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| 189 | for (;;) {
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| 190 | if (i == len) {
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| 191 | len+= 32;
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| 192 | w= allocate(w, configsize(len));
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| 193 | }
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| 194 |
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| 195 | if (q == -1) {
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| 196 | /* A word consists of letters, numbers and a few special chars. */
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| 197 | if (!isalnum(c) && c < 0x80 && strchr(SPECIAL, c) == nil) break;
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| 198 | } else {
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| 199 | /* Strings are made up of anything except newlines. */
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| 200 | if (c == EOF || c == '\n') {
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| 201 | fprintf(stderr,
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| 202 | "\"%s\", line %u: string at line %u not closed\n",
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| 203 | c_file, c_line, w->line);
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| 204 | exit(1);
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| 205 | break;
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| 206 | }
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| 207 | if (c == q) { /* Closing quote? */
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| 208 | nextc();
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| 209 | break;
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| 210 | }
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| 211 | }
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| 212 |
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| 213 | if (c != '\\') { /* Simply add non-escapes. */
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| 214 | w->word[i++]= c;
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| 215 | nextc();
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| 216 | } else { /* Interpret an escape. */
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| 217 | nextc();
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| 218 | if (isspace(c)) {
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| 219 | skipwhite();
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| 220 | continue;
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| 221 | }
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| 222 |
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| 223 | if (c_flags & CFG_ESCAPED) {
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| 224 | w->word[i++]= '\\'; /* Keep the \ for the caller. */
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| 225 | if (i == len) {
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| 226 | len+= 32;
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| 227 | w= allocate(w, configsize(len));
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| 228 | }
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| 229 | w->flags |= CFG_ESCAPED;
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| 230 | }
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| 231 |
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| 232 | if (isdigit(c)) { /* Octal escape */
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| 233 | int n= 3;
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| 234 | int d= 0;
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| 235 |
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| 236 | do {
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| 237 | d= d * 010 + (c - '0');
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| 238 | nextc();
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| 239 | } while (--n > 0 && isdigit(c));
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| 240 | w->word[i++]= d;
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| 241 | } else
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| 242 | if (c == 'x' || c == 'X') { /* Hex escape */
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| 243 | int n= 2;
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| 244 | int d= 0;
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| 245 |
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| 246 | nextc();
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| 247 | if (!isxdigit(c)) {
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| 248 | fprintf(stderr, "\"%s\", line %u: bad hex escape\n",
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| 249 | c_file, c_line);
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| 250 | exit(1);
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| 251 | }
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| 252 | do {
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| 253 | d= d * 0x10 + (islower(c) ? (c - 'a' + 0xa) :
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| 254 | isupper(c) ? (c - 'A' + 0xA) :
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| 255 | (c - '0'));
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| 256 | nextc();
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| 257 | } while (--n > 0 && isxdigit(c));
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| 258 | w->word[i++]= d;
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| 259 | } else {
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| 260 | switch (c) {
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| 261 | case 'a': c= '\a'; break;
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| 262 | case 'b': c= '\b'; break;
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| 263 | case 'e': c= '\033'; break;
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| 264 | case 'f': c= '\f'; break;
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| 265 | case 'n': c= '\n'; break;
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| 266 | case 'r': c= '\r'; break;
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| 267 | case 's': c= ' '; break;
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| 268 | case 't': c= '\t'; break;
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| 269 | case 'v': c= '\v'; break;
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| 270 | default: /* Anything else is kept as-is. */;
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| 271 | }
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| 272 | w->word[i++]= c;
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| 273 | nextc();
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| 274 | }
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| 275 | }
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| 276 | }
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| 277 | w->word[i]= 0;
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| 278 | if (q != -1) {
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| 279 | w->flags |= CFG_STRING;
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| 280 | } else {
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| 281 | int f;
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| 282 | char *end;
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| 283 | static char base[]= { 0, 010, 10, 0x10 };
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| 284 |
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| 285 | if (i == 0) parse_err();
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| 286 |
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| 287 | /* Can the word be used as a number? */
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| 288 | for (f= 0; f < 4; f++) {
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| 289 | (void) strtol(w->word, &end, base[f]);
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| 290 | if (*end == 0) w->flags |= 1 << (f + 0);
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| 291 | (void) strtoul(w->word, &end, base[f]);
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| 292 | if (*end == 0) w->flags |= 1 << (f + 4);
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| 293 | }
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| 294 | }
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| 295 | return allocate(w, configsize(i));
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| 296 | }
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| 297 |
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| 298 | static config_t *read_file(const char *file);
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| 299 | static config_t *read_list(void);
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| 300 |
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| 301 | static config_t *read_line(void)
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| 302 | /* Read and return one line of the config file. */
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| 303 | {
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| 304 | config_t *cline, **pcline, *clist;
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| 305 |
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| 306 | cline= nil;
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| 307 | pcline= &cline;
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| 308 |
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| 309 | for (;;) {
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| 310 | skipwhite();
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| 311 |
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| 312 | if (c == EOF || c == '}') {
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| 313 | if(0) if (cline != nil) parse_err();
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| 314 | break;
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| 315 | } else
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| 316 | if (c == ';') {
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| 317 | nextc();
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| 318 | if (cline != nil) break;
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| 319 | } else
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| 320 | if (cline != nil && c == '{') {
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| 321 | /* A sublist. */
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| 322 | nextc();
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| 323 | clist= allocate(nil, config0size());
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| 324 | clist->next= nil;
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| 325 | clist->file= c_file;
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| 326 | clist->line= c_line;
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| 327 | clist->list= read_list();
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| 328 | clist->flags= CFG_SUBLIST;
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| 329 | *pcline= clist;
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| 330 | pcline= &clist->next;
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| 331 | if (c != '}') parse_err();
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| 332 | nextc();
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| 333 | } else {
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| 334 | *pcline= read_word();
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| 335 | pcline= &(*pcline)->next;
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| 336 | }
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| 337 | }
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| 338 | return cline;
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| 339 | }
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| 340 |
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| 341 | static config_t *read_list(void)
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| 342 | /* Read and return a list of config file commands. */
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| 343 | {
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| 344 | config_t *clist, **pclist, *cline;
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| 345 |
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| 346 | clist= nil;
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| 347 | pclist= &clist;
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| 348 |
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| 349 | while ((cline= read_line()) != nil) {
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| 350 | if (strcmp(cline->word, "include") == 0) {
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| 351 | config_t *file= cline->next;
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| 352 | if (file == nil || file->next != nil || !config_isatom(file)) {
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| 353 | fprintf(stderr,
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| 354 | "\"%s\", line %u: 'include' command requires an argument\n",
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| 355 | c_file, cline->line);
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| 356 | exit(1);
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| 357 | }
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| 358 | if (file->flags & CFG_ESCAPED) {
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| 359 | char *p, *q;
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| 360 | p= q= file->word;
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| 361 | for (;;) {
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| 362 | if ((*q = *p) == '\\') *q = *++p;
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| 363 | if (*q == 0) break;
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| 364 | p++;
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| 365 | q++;
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| 366 | }
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| 367 | }
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| 368 | file= read_file(file->word);
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| 369 | delete_config(cline);
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| 370 | *pclist= file;
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| 371 | while (*pclist != nil) pclist= &(*pclist)->next;
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| 372 | } else {
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| 373 | config_t *cfg= allocate(nil, config0size());
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| 374 | cfg->next= nil;
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| 375 | cfg->list= cline;
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| 376 | cfg->file= cline->file;
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| 377 | cfg->line= cline->line;
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| 378 | cfg->flags= CFG_SUBLIST;
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| 379 | *pclist= cfg;
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| 380 | pclist= &cfg->next;
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| 381 | }
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| 382 | }
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| 383 | return clist;
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| 384 | }
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| 385 |
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| 386 | static config_t *read_file(const char *file)
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| 387 | /* Read and return a configuration file. */
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| 388 | {
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| 389 | configfile_t *cfgf;
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| 390 | config_t *cfg;
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| 391 | struct stat st;
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| 392 | FILE *old_fp; /* old_* variables store current file context. */
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| 393 | char *old_file;
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| 394 | unsigned old_line;
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| 395 | int old_c;
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| 396 | size_t n;
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| 397 | char *slash;
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| 398 |
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| 399 | old_fp= c_fp;
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| 400 | old_file= c_file;
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| 401 | old_line= c_line;
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| 402 | old_c= c;
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| 403 |
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| 404 | n= 0;
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| 405 | if (file[0] != '/' && old_file != nil
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| 406 | && (slash= strrchr(old_file, '/')) != nil) {
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| 407 | n= slash - old_file + 1;
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| 408 | }
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| 409 | cfgf= allocate(nil, configfilesize(n + strlen(file)));
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| 410 | memcpy(cfgf->name, old_file, n);
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| 411 | strcpy(cfgf->name + n, file);
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| 412 | cfgf->next= c_files;
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| 413 | c_files= cfgf;
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| 414 |
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| 415 | c_file= cfgf->name;
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| 416 | c_line= 0;
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| 417 |
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| 418 | if ((c_fp= fopen(file, "r")) == nil || fstat(fileno(c_fp), &st) < 0) {
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| 419 | if (errno != ENOENT) {
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| 420 | fprintf(stderr, "\"%s\", line 1: %s\n", file, strerror(errno));
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| 421 | exit(1);
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| 422 | }
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| 423 | cfgf->ctime= -1;
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| 424 | c= EOF;
|
|---|
| 425 | } else {
|
|---|
| 426 | cfgf->ctime= st.st_ctime;
|
|---|
| 427 | c= '\n';
|
|---|
| 428 | }
|
|---|
| 429 |
|
|---|
| 430 | cfg= read_list();
|
|---|
| 431 | if (c != EOF) parse_err();
|
|---|
| 432 |
|
|---|
| 433 | if (c_fp != nil) fclose(c_fp);
|
|---|
| 434 | c_fp= old_fp;
|
|---|
| 435 | c_file= old_file;
|
|---|
| 436 | c_line= old_line;
|
|---|
| 437 | c= old_c;
|
|---|
| 438 | return cfg;
|
|---|
| 439 | }
|
|---|
| 440 |
|
|---|
| 441 | config_t *config_read(const char *file, int flags, config_t *cfg)
|
|---|
| 442 | /* Read and parse a configuration file. */
|
|---|
| 443 | {
|
|---|
| 444 | if (cfg != nil) {
|
|---|
| 445 | /* First check if any of the involved files has changed. */
|
|---|
| 446 | firstconfig_t *fcfg;
|
|---|
| 447 | configfile_t *cfgf;
|
|---|
| 448 | struct stat st;
|
|---|
| 449 |
|
|---|
| 450 | fcfg= cfg2fcfg(cfg);
|
|---|
| 451 | for (cfgf= fcfg->filelist; cfgf != nil; cfgf= cfgf->next) {
|
|---|
| 452 | if (stat(cfgf->name, &st) < 0) {
|
|---|
| 453 | if (errno != ENOENT) break;
|
|---|
| 454 | st.st_ctime= -1;
|
|---|
| 455 | }
|
|---|
| 456 | if (st.st_ctime != cfgf->ctime) break;
|
|---|
| 457 | }
|
|---|
| 458 |
|
|---|
| 459 | if (cfgf == nil) return cfg; /* Everything as it was. */
|
|---|
| 460 | config_delete(cfg); /* Otherwise delete and reread. */
|
|---|
| 461 | }
|
|---|
| 462 |
|
|---|
| 463 | errno= 0;
|
|---|
| 464 | c_files= nil;
|
|---|
| 465 | c_flags= flags;
|
|---|
| 466 | cfg= read_file(file);
|
|---|
| 467 |
|
|---|
| 468 | if (cfg != nil) {
|
|---|
| 469 | /* Change first word to have a hidden pointer to a file list. */
|
|---|
| 470 | size_t len= strlen(cfg->word);
|
|---|
| 471 | firstconfig_t *fcfg;
|
|---|
| 472 |
|
|---|
| 473 | fcfg= allocate(cfg, firstconfigsize(len));
|
|---|
| 474 | memmove(&fcfg->config1, fcfg, configsize(len));
|
|---|
| 475 | fcfg->filelist= c_files;
|
|---|
| 476 | fcfg->new= 1;
|
|---|
| 477 | return fcfg2cfg(fcfg);
|
|---|
| 478 | }
|
|---|
| 479 | /* Couldn't read (errno != 0) of nothing read (errno == 0). */
|
|---|
| 480 | delete_filelist(c_files);
|
|---|
| 481 | delete_config(cfg);
|
|---|
| 482 | return nil;
|
|---|
| 483 | }
|
|---|
| 484 |
|
|---|
| 485 | int config_renewed(config_t *cfg)
|
|---|
| 486 | {
|
|---|
| 487 | int new;
|
|---|
| 488 |
|
|---|
| 489 | if (cfg == nil) {
|
|---|
| 490 | new= 1;
|
|---|
| 491 | } else {
|
|---|
| 492 | new= cfg2fcfg(cfg)->new;
|
|---|
| 493 | cfg2fcfg(cfg)->new= 0;
|
|---|
| 494 | }
|
|---|
| 495 | return new;
|
|---|
| 496 | }
|
|---|
| 497 |
|
|---|
| 498 | size_t config_length(config_t *cfg)
|
|---|
| 499 | /* Count the number of items on a list. */
|
|---|
| 500 | {
|
|---|
| 501 | size_t n= 0;
|
|---|
| 502 |
|
|---|
| 503 | while (cfg != nil) {
|
|---|
| 504 | n++;
|
|---|
| 505 | cfg= cfg->next;
|
|---|
| 506 | }
|
|---|
| 507 | return n;
|
|---|
| 508 | }
|
|---|
| 509 |
|
|---|
| 510 | #if TEST
|
|---|
| 511 | #include <unistd.h>
|
|---|
| 512 |
|
|---|
| 513 | static void print_list(int indent, config_t *cfg);
|
|---|
| 514 |
|
|---|
| 515 | static void print_words(int indent, config_t *cfg)
|
|---|
| 516 | {
|
|---|
| 517 | while (cfg != nil) {
|
|---|
| 518 | if (config_isatom(cfg)) {
|
|---|
| 519 | if (config_isstring(cfg)) fputc('"', stdout);
|
|---|
| 520 | printf("%s", cfg->word);
|
|---|
| 521 | if (config_isstring(cfg)) fputc('"', stdout);
|
|---|
| 522 | } else {
|
|---|
| 523 | printf("{\n");
|
|---|
| 524 | print_list(indent+4, cfg->list);
|
|---|
| 525 | printf("%*s}", indent, "");
|
|---|
| 526 | }
|
|---|
| 527 | cfg= cfg->next;
|
|---|
| 528 | if (cfg != nil) fputc(' ', stdout);
|
|---|
| 529 | }
|
|---|
| 530 | printf(";\n");
|
|---|
| 531 | }
|
|---|
| 532 |
|
|---|
| 533 | static void print_list(int indent, config_t *cfg)
|
|---|
| 534 | {
|
|---|
| 535 | while (cfg != nil) {
|
|---|
| 536 | if (!config_issub(cfg)) {
|
|---|
| 537 | fprintf(stderr, "Cell at \"%s\", line %u is not a sublist\n");
|
|---|
| 538 | break;
|
|---|
| 539 | }
|
|---|
| 540 | printf("%*s", indent, "");
|
|---|
| 541 | print_words(indent, cfg->list);
|
|---|
| 542 | cfg= cfg->next;
|
|---|
| 543 | }
|
|---|
| 544 | }
|
|---|
| 545 |
|
|---|
| 546 | static void print_config(config_t *cfg)
|
|---|
| 547 | {
|
|---|
| 548 | if (!config_renewed(cfg)) {
|
|---|
| 549 | printf("# Config didn't change\n");
|
|---|
| 550 | } else {
|
|---|
| 551 | print_list(0, cfg);
|
|---|
| 552 | }
|
|---|
| 553 | }
|
|---|
| 554 |
|
|---|
| 555 | int main(int argc, char **argv)
|
|---|
| 556 | {
|
|---|
| 557 | config_t *cfg;
|
|---|
| 558 | int c;
|
|---|
| 559 |
|
|---|
| 560 | if (argc != 2) {
|
|---|
| 561 | fprintf(stderr, "One config file name please\n");
|
|---|
| 562 | exit(1);
|
|---|
| 563 | }
|
|---|
| 564 |
|
|---|
| 565 | cfg= nil;
|
|---|
| 566 | do {
|
|---|
| 567 | cfg= config_read(argv[1], CFG_ESCAPED, cfg);
|
|---|
| 568 | print_config(cfg);
|
|---|
| 569 | if (!isatty(0)) break;
|
|---|
| 570 | while ((c= getchar()) != EOF && c != '\n') {}
|
|---|
| 571 | } while (c != EOF);
|
|---|
| 572 | return 0;
|
|---|
| 573 | }
|
|---|
| 574 | #endif /* TEST */
|
|---|
