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hcre.c
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hcre.c
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#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <locale.h>
#include <string.h>
#include "rules.h"
typedef struct RuleHash {
// The Rule struct itself
Rule *rule;
// Info about where the rule came from
// This makes it easier to track down rule errors and dupes
char *source_file, *source_text;
unsigned int source_line;
// Used by HASH_* functions
UT_hash_handle hh;
} RuleHash;
void free_hash(RuleHash *hash) {
if (hash == NULL) { return; }
if (hash->rule ) { free_rule(hash->rule); }
if (hash->source_file) { free(hash->source_file); }
if (hash->source_text) { free(hash->source_text); }
memset(hash, 0, sizeof(RuleHash));
}
void usage(char *hcre) {
printf("\n");
printf("USAGE: %s rule_file [rule_file ...]\n", hcre);
printf("\n");
printf("Input words are read from STDIN, mangled words are written on STDOUT\n");
printf("All rule files are unioned together and duplicate rules are removed\n");
printf("For a cross product of rules, pipe this program into another instance of itself\n");
printf("\n");
printf("\n");
printf("EXAMPLE:\n");
printf(" %s best64.rule < words.txt\n", hcre);
printf(" some_process | %s leetspeak.rule combinator.rule\n", hcre);
printf("\n");
}
int main(int argc, char **argv) {
if (argc <= 1) { usage(argv[0]); return 0; }
// Allows rule upper/lower/toggle to follow locale
setlocale(LC_CTYPE, "");
// Our hash structure's head node
RuleHash *rules = NULL;
// For iterating rules hash with HASH_ITER
RuleHash *hash_temp = NULL;
// Output for prase_rule()
Rule *cur_rule = NULL;
// Reading/writing to rules hash
RuleHash *cur_hash = NULL;
// getline() will read into this
char *line = NULL;
ssize_t line_len = 0;
size_t line_malloc_size = 0;
unsigned int error_count = 0;
unsigned int dupe_count = 0;
// Process each file of rules
for (int file_num = 1; file_num < argc; file_num++) {
char *file_name = argv[file_num];
FILE *rule_file = fopen(file_name, "rb");
// Make sure we successfully opened the rule file
if (rule_file == NULL) {
fprintf(stderr, "ERROR: Failed to open input file <%s>\n", file_name);
return -1;
}
// Read each rule from the input file
unsigned int line_num = 0;
while ( !feof(rule_file) ) {
line_len = getline(&line, &line_malloc_size, rule_file);
// Stop processing file on error or end of input (we don't care which)
if (line_len <= 0) { break; }
line_num++;
// Trim trailing newline by overwriting it will a NULL terminator
while (line[line_len - 1] == '\n' || line[line_len - 1] == '\r') {
line[--line_len] = 0;
}
// Skip empty lines and commented lines
if (line_len == 0 ) { continue; }
if (line[0] == '#') { continue; }
#ifdef DEBUG_PARSING
fprintf(stderr, "Before Parsing: %s (Length: %d)\n", line, line_len);
#endif
// Prase and validate the rule into cur_rule
int rule_check = parse_rule(line, line_len, &cur_rule);
if (rule_check < 0) {
fprintf(
stderr, "File: <%s>; Line: <%u>; Rule: <%s>; Error: %s\n",
file_name, line_num, line, cur_rule->text
);
error_count++;
continue;
}
#ifdef DEBUG_PARSING
fprintf(stderr, "After Parsing: %s (Length: %d)\n", cur_rule->text, cur_rule->length);
fprintf(stderr, "\n");
#endif
// Check if the cleaned rule is a dupe
HASH_FIND(hh, rules, cur_rule->text, cur_rule->length, hash_temp);
if (hash_temp != NULL) {
#ifdef DEBUG_DUPES
fprintf(
stderr, "File: <%s>; Line: <%u>; Rule: <%s>; Duplicate of <%s> from <%s> line <%u>\n",
file_name, line_num, line,
hash_temp->source_text, hash_temp->source_file, hash_temp->source_line
);
#endif
dupe_count++;
continue;
}
// Make a new hash entry from the current rule
cur_hash = (RuleHash *)calloc(1, sizeof(RuleHash));
cur_hash->rule = clone_rule(cur_rule);
cur_hash->source_file = strdup(file_name);
cur_hash->source_line = line_num;
cur_hash->source_text = strdup(line);
// If clone_rule() failed, we have a major problem
if (!cur_hash->rule) {
fprintf(stderr, "Failed to clone rule, aborting\n");
return -1;
}
HASH_ADD_KEYPTR(hh, rules, cur_hash->rule->text, cur_hash->rule->length, cur_hash);
}
fclose(rule_file);
}
#ifdef DEBUG_STATS
fprintf(
stderr, "Loaded %u rules, skipped %u broken and %u duplicate rules\n",
HASH_COUNT(rules), error_count, dupe_count
);
#endif
// Our mangled text ends up here
char rule_output[BLOCK_SIZE];
// Statistics
unsigned long int word_count = 0;
unsigned long int reject_count = 0;
// Increase the output buffering
if (setvbuf(stdout, NULL, _IOFBF, 1024 * 1024) != 0) {
fprintf(stderr, "Failed to adjust stdout buffer size\n");
}
// Main processing loop, runs for each line of input
while ( !feof(stdin) ) {
line_len = getline(&line, &line_malloc_size, stdin);
// Error or end of input
if (line_len <= 0) { break; }
// Trim trailing newline, skip blank lines
line[--line_len] = 0;
if (line_len == 0) { continue; }
// Safely iterate the rules hash
HASH_ITER(hh, rules, cur_hash, hash_temp) {
cur_rule = cur_hash->rule;
// Apply the rule operations
int rule_rtn = apply_rule(cur_rule, line, line_len, rule_output);
// Something broke?
if (rule_rtn < 0) {
if (rule_rtn == REJECTED) {
// Rejections are expected, they're okay
reject_count++;
} else {
// We missed something in parsing and now our rule broke
// We can't "fix" the rule, so our only option is to remove it
// If you ever see this message, please contact the developer
fprintf(stderr,
"Input word <%s> broke rule <%s> from file <%s>, line <%u> (parsed as <%s>): %s\n",
line,
cur_hash->source_text, cur_hash->source_file, cur_hash->source_line, cur_rule->text,
rule_output
);
HASH_DEL(rules, cur_hash);
free_hash(cur_hash);
}
// Regardless if this was a rejection or error, we're not printing this word
continue;
}
// In debug mode, include the rule itself with the output
#ifdef DEBUG_OUTPUT
fwrite(cur_rule->text, cur_rule->length, 1, stdout);
fputc('\t', stdout);
#endif
// Output the mangled word and a newline
rule_output[rule_rtn++] = '\n';
fwrite(rule_output, rule_rtn, 1, stdout);
word_count++;
}
}
#ifdef DEBUG_STATS
fprintf(stderr, "Created %lu words, rejected %lu\n", word_count, reject_count);
#endif
return 0;
}