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#include <ctype.h>
#include <pthread.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct slice {
char* ref;
size_t len;
} slice_t;
typedef struct pair {
slice_t key;
slice_t value;
} pair_t;
pair_t* global_arg_table = NULL;
size_t args_count = 0;
void parse_config_file(const char* filename) {
FILE* file = fopen(filename, "r");
if (!file) {
fprintf(stderr, "failed to open config file: %s\n", filename);
exit(1);
}
char* line = NULL;
size_t len = 0;
ssize_t read;
size_t new_args_count = args_count;
while ((read = getline(&line, &len, file)) != -1) {
if (read > 0 && line[0] != '#' && line[0] != '\n') {
new_args_count++;
}
}
rewind(file);
if (new_args_count > args_count) {
pair_t* new_table = realloc(global_arg_table, new_args_count * sizeof(pair_t));
if (!new_table) {
fprintf(stderr, "realloc failed for config file parsing\n");
fclose(file);
free(line);
exit(1);
}
global_arg_table = new_table;
}
while ((read = getline(&line, &len, file)) != -1) {
if (read <= 1 || line[0] == '#' || line[0] == '\n') continue;
if (line[read - 1] == '\n') line[read - 1] = '\0';
char* current = line;
char* eq_sign = strchr(current, '=');
if (eq_sign == NULL) {
fprintf(stderr, "config file error: expected 'key=value' in '%s'\n", current);
continue;
}
// key
size_t key_len = eq_sign - current;
size_t key_start = 0;
while (key_start < key_len && isspace(current[key_start])) {
key_start++;
key_len--;
}
while (key_len > 0 && isspace(current[key_start + key_len - 1])) {
key_len--;
}
if (key_len == 0) {
fprintf(stderr, "config file error: empty key in '%s'\n", current);
continue;
}
// value
size_t value_start = eq_sign - current + 1;
size_t value_len = strlen(current) - value_start;
while (value_start < strlen(current) && isspace(current[value_start])) {
value_start++;
value_len--;
}
while (value_len > 0 && isspace(current[value_start + value_len - 1])) {
value_len--;
}
// store
char* key_str = strndup(current + key_start, key_len);
char* value_str = strndup(current + value_start, value_len);
if (!key_str || !value_str) {
fprintf(stderr, "strndup failed for config file parsing\n");
free(key_str);
free(value_str);
fclose(file);
free(line);
exit(1);
}
global_arg_table[args_count].key.ref = key_str;
global_arg_table[args_count].key.len = key_len;
global_arg_table[args_count].value.ref = value_str;
global_arg_table[args_count].value.len = value_len;
args_count++;
}
fclose(file);
free(line);
}
void parse_arguments(int argc, char** argv) {
if (argc <= 1) return;
global_arg_table = calloc(argc - 1, sizeof(pair_t));
if (!global_arg_table) {
fprintf(stderr, "calloc failed for argument parsing\n");
exit(1);
}
for (int i = 1; i < argc; i++) {
char* current = argv[i];
char* eq_sign = strchr(current, '=');
if (eq_sign == NULL) {
printf(
"argument error: "
"moonpaste expects named arguments with values. example: 'foo=bar'\n"
" in '%s'",
current);
exit(1);
}
// Key
size_t key_len = eq_sign - current;
size_t key_start = 0;
while (key_start < key_len && isspace(current[key_start])) {
key_start++;
key_len--;
}
while (key_len > 0 && isspace(current[key_start + key_len - 1])) {
key_len--;
}
if (key_len == 0) {
printf(
"argument error: empty key\n"
" in '%s'\n",
current);
exit(1);
}
// value
size_t value_start = eq_sign - current + 1;
size_t value_len = strlen(current) - value_start;
while (value_start < strlen(current) && isspace(current[value_start])) {
value_start++;
value_len--;
}
while (value_len > 0 && isspace(current[value_start + value_len - 1])) {
value_len--;
}
// config file
if (key_len == 6 && strncmp(current + key_start, "config", 6) == 0) {
char* config_file = strndup(current + value_start, value_len);
if (!config_file) {
fprintf(stderr, "strndup failed for config file path\n");
exit(1);
}
parse_config_file(config_file);
free(config_file);
continue;
}
// store
global_arg_table[args_count].key.ref = current + key_start;
global_arg_table[args_count].key.len = key_len;
global_arg_table[args_count].value.ref = current + value_start;
global_arg_table[args_count].value.len = value_len;
args_count++;
}
}
char* get_config(char* key, bool mandatory) {
size_t len = strlen(key);
for (int i = 0; i < args_count; i++) {
if (global_arg_table[i].key.len != len) continue;
if (strncmp(key, global_arg_table[i].key.ref, len) != 0) continue;
char* new_str = strndup(global_arg_table[i].value.ref, global_arg_table[i].value.len);
if (!new_str && mandatory) {
fprintf(stderr, "strndup failed for config value\n");
exit(1);
}
return new_str; // free me!
}
if (!mandatory) return NULL;
fprintf(stderr, "program expected argument %s but did not receive it.\n", key);
return NULL;
}
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