574 lines
12 KiB
C
574 lines
12 KiB
C
/* config_read(), _delete(), _length() - Generic config file routines.
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* Author: Kees J. Bot
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* 5 Jun 1999
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*/
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#define nil ((void*)0)
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#if __minix_vmd
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#include <minix/stubs.h>
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#else
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#define fstat _fstat
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#define stat _stat
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#endif
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#include <sys/types.h>
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#include <stdio.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <time.h>
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#include <sys/stat.h>
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#if __minix_vmd
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#include <minix/asciictype.h>
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#else
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#include <ctype.h>
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#endif
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#define _c /* not const */
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#include <configfile.h>
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typedef struct configfile { /* List of (included) configuration files. */
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struct configfile *next; /* A list indeed. */
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time_t ctime; /* Last changed time, -1 if no file. */
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char name[1]; /* File name. */
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} configfile_t;
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/* Size of a configfile_t given a file name of length 'len'. */
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#define configfilesize(len) (offsetof(configfile_t, name) + 1 + (len))
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typedef struct firstconfig { /* First file and first word share a slot. */
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configfile_t *filelist;
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char new; /* Set when created. */
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config_t config1;
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} firstconfig_t;
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/* Size of a config_t given a word of lenght 'len'. Same for firstconfig_t. */
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#define config0size() (offsetof(config_t, word))
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#define configsize(len) (config0size() + 1 + (len))
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#define firstconfigsize(len) \
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(offsetof(firstconfig_t, config1) + configsize(len))
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/* Translate address of first config word to enclosing firstconfig_t and vv. */
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#define cfg2fcfg(p) \
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((firstconfig_t *) ((char *) (p) - offsetof(firstconfig_t, config1)))
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#define fcfg2cfg(p) (&(p)->config1)
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/* Variables used while building data. */
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static configfile_t *c_files; /* List of (included) config files. */
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static int c_flags; /* Flags argument of config_read(). */
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static FILE *c_fp; /* Current open file. */
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static char *c_file; /* Current open file name. */
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static unsigned c_line; /* Current line number. */
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static int c; /* Next character. */
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static void *allocate(void *mem, size_t size)
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/* Like realloc(), but checked. */
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{
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if ((mem= realloc(mem, size)) == nil) {
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fprintf(stderr, "\"%s\", line %u: Out of memory\n", c_file, c_line);
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exit(1);
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}
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return mem;
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}
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#define deallocate(mem) free(mem)
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static void delete_filelist(configfile_t *cfgf)
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/* Delete configuration file list. */
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{
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void *junk;
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while (cfgf != nil) {
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junk= cfgf;
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cfgf= cfgf->next;
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deallocate(junk);
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}
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}
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static void delete_config(config_t *cfg)
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/* Delete configuration file data. */
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{
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config_t *next, *list, *junk;
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next= cfg;
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list= nil;
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for (;;) {
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if (next != nil) {
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/* Push the 'next' chain in reverse on the 'list' chain, putting
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* a leaf cell (next == nil) on top of 'list'.
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*/
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junk= next;
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next= next->next;
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junk->next= list;
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list= junk;
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} else
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if (list != nil) {
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/* Delete the leaf cell. If it has a sublist then that becomes
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* the 'next' chain.
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*/
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junk= list;
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next= list->list;
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list= list->next;
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deallocate(junk);
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} else {
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/* Both chains are gone. */
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break;
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}
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}
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}
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void config_delete(config_t *cfg1)
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/* Delete configuration file data, being careful with the odd first one. */
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{
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firstconfig_t *fcfg= cfg2fcfg(cfg1);
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delete_filelist(fcfg->filelist);
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delete_config(fcfg->config1.next);
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delete_config(fcfg->config1.list);
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deallocate(fcfg);
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}
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static void nextc(void)
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/* Read the next character of the current file into 'c'. */
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{
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if (c == '\n') c_line++;
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c= getc(c_fp);
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if (c == EOF && ferror(c_fp)) {
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fprintf(stderr, "\"%s\", line %u: %s\n",
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c_file, c_line, strerror(errno));
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exit(1);
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}
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}
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static void skipwhite(void)
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/* Skip whitespace and comments. */
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{
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while (isspace(c)) {
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nextc();
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if (c == '#') {
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do nextc(); while (c != EOF && c != '\n');
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}
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}
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}
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static void parse_err(void)
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/* Tell user that you can't parse past the current character. */
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{
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char sc[2];
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sc[0]= c;
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sc[1]= 0;
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fprintf(stderr, "\"%s\", line %u: parse error at '%s'\n",
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c_file, c_line, c == EOF ? "EOF" : sc);
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exit(1);
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}
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static config_t *read_word(void)
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/* Read a word or string. */
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{
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config_t *w;
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size_t i, len;
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int q;
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static char SPECIAL[] = "!#$%&*+-./:<=>?[\\]^_|~";
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i= 0;
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len= 32;
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w= allocate(nil, configsize(32));
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w->next= nil;
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w->list= nil;
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w->file= c_file;
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w->line= c_line;
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w->flags= 0;
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/* Is it a quoted string? */
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if (c == '\'' || c == '"') {
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q= c; /* yes */
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nextc();
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} else {
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q= -1; /* no */
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}
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for (;;) {
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if (i == len) {
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len+= 32;
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w= allocate(w, configsize(len));
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}
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if (q == -1) {
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/* A word consists of letters, numbers and a few special chars. */
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if (!isalnum(c) && c < 0x80 && strchr(SPECIAL, c) == nil) break;
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} else {
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/* Strings are made up of anything except newlines. */
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if (c == EOF || c == '\n') {
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fprintf(stderr,
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"\"%s\", line %u: string at line %u not closed\n",
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c_file, c_line, w->line);
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exit(1);
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break;
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}
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if (c == q) { /* Closing quote? */
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nextc();
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break;
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}
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}
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if (c != '\\') { /* Simply add non-escapes. */
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w->word[i++]= c;
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nextc();
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} else { /* Interpret an escape. */
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nextc();
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if (isspace(c)) {
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skipwhite();
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continue;
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}
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if (c_flags & CFG_ESCAPED) {
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w->word[i++]= '\\'; /* Keep the \ for the caller. */
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if (i == len) {
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len+= 32;
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w= allocate(w, configsize(len));
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}
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w->flags |= CFG_ESCAPED;
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}
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if (isdigit(c)) { /* Octal escape */
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int n= 3;
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int d= 0;
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do {
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d= d * 010 + (c - '0');
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nextc();
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} while (--n > 0 && isdigit(c));
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w->word[i++]= d;
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} else
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if (c == 'x' || c == 'X') { /* Hex escape */
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int n= 2;
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int d= 0;
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nextc();
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if (!isxdigit(c)) {
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fprintf(stderr, "\"%s\", line %u: bad hex escape\n",
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c_file, c_line);
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exit(1);
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}
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do {
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d= d * 0x10 + (islower(c) ? (c - 'a' + 0xa) :
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isupper(c) ? (c - 'A' + 0xA) :
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(c - '0'));
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nextc();
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} while (--n > 0 && isxdigit(c));
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w->word[i++]= d;
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} else {
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switch (c) {
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case 'a': c= '\a'; break;
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case 'b': c= '\b'; break;
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case 'e': c= '\033'; break;
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case 'f': c= '\f'; break;
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case 'n': c= '\n'; break;
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case 'r': c= '\r'; break;
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case 's': c= ' '; break;
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case 't': c= '\t'; break;
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case 'v': c= '\v'; break;
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default: /* Anything else is kept as-is. */;
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}
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w->word[i++]= c;
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nextc();
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}
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}
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}
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w->word[i]= 0;
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if (q != -1) {
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w->flags |= CFG_STRING;
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} else {
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int f;
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char *end;
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static char base[]= { 0, 010, 10, 0x10 };
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if (i == 0) parse_err();
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/* Can the word be used as a number? */
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for (f= 0; f < 4; f++) {
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(void) strtol(w->word, &end, base[f]);
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if (*end == 0) w->flags |= 1 << (f + 0);
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(void) strtoul(w->word, &end, base[f]);
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if (*end == 0) w->flags |= 1 << (f + 4);
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}
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}
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return allocate(w, configsize(i));
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}
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static config_t *read_file(const char *file);
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static config_t *read_list(void);
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static config_t *read_line(void)
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/* Read and return one line of the config file. */
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{
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config_t *cline, **pcline, *clist;
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cline= nil;
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pcline= &cline;
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for (;;) {
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skipwhite();
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if (c == EOF || c == '}') {
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if(0) if (cline != nil) parse_err();
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break;
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} else
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if (c == ';') {
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nextc();
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if (cline != nil) break;
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} else
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if (cline != nil && c == '{') {
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/* A sublist. */
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nextc();
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clist= allocate(nil, config0size());
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clist->next= nil;
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clist->file= c_file;
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clist->line= c_line;
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clist->list= read_list();
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clist->flags= CFG_SUBLIST;
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*pcline= clist;
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pcline= &clist->next;
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if (c != '}') parse_err();
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nextc();
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} else {
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*pcline= read_word();
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pcline= &(*pcline)->next;
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}
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}
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return cline;
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}
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static config_t *read_list(void)
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/* Read and return a list of config file commands. */
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{
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config_t *clist, **pclist, *cline;
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clist= nil;
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pclist= &clist;
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while ((cline= read_line()) != nil) {
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if (strcmp(cline->word, "include") == 0) {
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config_t *file= cline->next;
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if (file == nil || file->next != nil || !config_isatom(file)) {
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fprintf(stderr,
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"\"%s\", line %u: 'include' command requires an argument\n",
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c_file, cline->line);
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exit(1);
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}
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if (file->flags & CFG_ESCAPED) {
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char *p, *q;
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p= q= file->word;
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for (;;) {
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if ((*q = *p) == '\\') *q = *++p;
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if (*q == 0) break;
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p++;
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q++;
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}
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}
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file= read_file(file->word);
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delete_config(cline);
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*pclist= file;
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while (*pclist != nil) pclist= &(*pclist)->next;
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} else {
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config_t *cfg= allocate(nil, config0size());
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cfg->next= nil;
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cfg->list= cline;
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cfg->file= cline->file;
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cfg->line= cline->line;
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cfg->flags= CFG_SUBLIST;
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*pclist= cfg;
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pclist= &cfg->next;
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}
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}
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return clist;
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}
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static config_t *read_file(const char *file)
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/* Read and return a configuration file. */
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{
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configfile_t *cfgf;
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config_t *cfg;
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struct stat st;
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FILE *old_fp; /* old_* variables store current file context. */
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char *old_file;
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unsigned old_line;
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int old_c;
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size_t n;
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char *slash;
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old_fp= c_fp;
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old_file= c_file;
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old_line= c_line;
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old_c= c;
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n= 0;
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if (file[0] != '/' && old_file != nil
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&& (slash= strrchr(old_file, '/')) != nil) {
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n= slash - old_file + 1;
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}
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cfgf= allocate(nil, configfilesize(n + strlen(file)));
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memcpy(cfgf->name, old_file, n);
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strcpy(cfgf->name + n, file);
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cfgf->next= c_files;
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c_files= cfgf;
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c_file= cfgf->name;
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c_line= 0;
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if ((c_fp= fopen(file, "r")) == nil || fstat(fileno(c_fp), &st) < 0) {
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if (errno != ENOENT) {
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fprintf(stderr, "\"%s\", line 1: %s\n", file, strerror(errno));
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exit(1);
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}
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cfgf->ctime= -1;
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c= EOF;
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} else {
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cfgf->ctime= st.st_ctime;
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c= '\n';
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}
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cfg= read_list();
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if (c != EOF) parse_err();
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if (c_fp != nil) fclose(c_fp);
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c_fp= old_fp;
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c_file= old_file;
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c_line= old_line;
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c= old_c;
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return cfg;
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}
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config_t *config_read(const char *file, int flags, config_t *cfg)
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/* Read and parse a configuration file. */
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{
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if (cfg != nil) {
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/* First check if any of the involved files has changed. */
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firstconfig_t *fcfg;
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configfile_t *cfgf;
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struct stat st;
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fcfg= cfg2fcfg(cfg);
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for (cfgf= fcfg->filelist; cfgf != nil; cfgf= cfgf->next) {
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if (stat(cfgf->name, &st) < 0) {
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if (errno != ENOENT) break;
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st.st_ctime= -1;
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}
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if (st.st_ctime != cfgf->ctime) break;
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}
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if (cfgf == nil) return cfg; /* Everything as it was. */
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config_delete(cfg); /* Otherwise delete and reread. */
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}
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errno= 0;
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c_files= nil;
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c_flags= flags;
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cfg= read_file(file);
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if (cfg != nil) {
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/* Change first word to have a hidden pointer to a file list. */
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size_t len= strlen(cfg->word);
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firstconfig_t *fcfg;
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fcfg= allocate(cfg, firstconfigsize(len));
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memmove(&fcfg->config1, fcfg, configsize(len));
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fcfg->filelist= c_files;
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fcfg->new= 1;
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return fcfg2cfg(fcfg);
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}
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/* Couldn't read (errno != 0) of nothing read (errno == 0). */
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delete_filelist(c_files);
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delete_config(cfg);
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return nil;
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}
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int config_renewed(config_t *cfg)
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{
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int new;
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if (cfg == nil) {
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new= 1;
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} else {
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new= cfg2fcfg(cfg)->new;
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cfg2fcfg(cfg)->new= 0;
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}
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return new;
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}
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size_t config_length(config_t *cfg)
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/* Count the number of items on a list. */
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{
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size_t n= 0;
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while (cfg != nil) {
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n++;
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cfg= cfg->next;
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}
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return n;
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}
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#if TEST
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#include <unistd.h>
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static void print_list(int indent, config_t *cfg);
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static void print_words(int indent, config_t *cfg)
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{
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while (cfg != nil) {
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if (config_isatom(cfg)) {
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if (config_isstring(cfg)) fputc('"', stdout);
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printf("%s", cfg->word);
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if (config_isstring(cfg)) fputc('"', stdout);
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} else {
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printf("{\n");
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print_list(indent+4, cfg->list);
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printf("%*s}", indent, "");
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}
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cfg= cfg->next;
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if (cfg != nil) fputc(' ', stdout);
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}
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printf(";\n");
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}
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static void print_list(int indent, config_t *cfg)
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{
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while (cfg != nil) {
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if (!config_issub(cfg)) {
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fprintf(stderr, "Cell at \"%s\", line %u is not a sublist\n");
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break;
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}
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printf("%*s", indent, "");
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print_words(indent, cfg->list);
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cfg= cfg->next;
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}
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}
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static void print_config(config_t *cfg)
|
|
{
|
|
if (!config_renewed(cfg)) {
|
|
printf("# Config didn't change\n");
|
|
} else {
|
|
print_list(0, cfg);
|
|
}
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
config_t *cfg;
|
|
int c;
|
|
|
|
if (argc != 2) {
|
|
fprintf(stderr, "One config file name please\n");
|
|
exit(1);
|
|
}
|
|
|
|
cfg= nil;
|
|
do {
|
|
cfg= config_read(argv[1], CFG_ESCAPED, cfg);
|
|
print_config(cfg);
|
|
if (!isatty(0)) break;
|
|
while ((c= getchar()) != EOF && c != '\n') {}
|
|
} while (c != EOF);
|
|
return 0;
|
|
}
|
|
#endif /* TEST */
|