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/*
* ecgen, tool for generating Elliptic curve domain parameters
* Copyright (C) 2017-2018 J08nY
*/
#include "str.h"
#include <ctype.h>
#include <stdarg.h>
#include <string.h>
#include "util/memory.h"
const char *str_is_hex(const char *hex_str) {
const char *str_start = hex_str;
if (strlen(hex_str) > 2) {
if (hex_str[0] == '0' && (hex_str[1] == 'x' || hex_str[1] == 'X')) {
str_start = hex_str + 2;
}
}
const char *s = str_start;
while (*s != 0) {
char c = *s++;
if (!isxdigit(c)) return NULL;
}
return str_start;
}
char *str_join(char *separator, char **strings, size_t len) {
size_t total = 1;
for (size_t i = 0; i < len; ++i) {
if (strings[i]) total += strlen(strings[i]);
}
if (separator) total += (len - 1) * strlen(separator);
char *result = try_calloc(total);
for (size_t i = 0; i < len; ++i) {
if (strings[i]) {
strcat(result, strings[i]);
}
if (separator && i != len - 1) {
strcat(result, separator);
}
}
return result;
}
char *str_joinv(char *separator, ...) {
va_list valist;
va_start(valist, separator);
size_t len = 5;
char **strings = try_malloc(len * sizeof(char *));
char *next;
size_t i = 0;
while ((next = va_arg(valist, char *)) != NULL) {
if (i == len) {
strings = try_realloc(strings, (len * 2) * sizeof(char *));
}
strings[i++] = next;
}
va_end(valist);
char *result = str_join(separator, strings, i);
try_free(strings);
return result;
}
char *str_concat(char **strings, size_t len) {
return str_join(NULL, strings, len);
}
size_t str_cnt(const char *str, const char c) {
size_t result = 0;
for (; str[result]; str[result] == c ? result++ : *str++)
;
return result;
}
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