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2 nishi 1 
/* $Id: string.c 5 2024-09-13 10:08:00Z nishi $ */
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#include <string.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <ctype.h>
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char* cm_strcat(const char* a, const char* b) {
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	char* str = malloc(strlen(a) + strlen(b) + 1);
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	memcpy(str, a, strlen(a));
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	memcpy(str + strlen(a), b, strlen(b));
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	str[strlen(a) + strlen(b)] = 0;
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	return str;
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}
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char* cm_strdup(const char* str) { return cm_strcat(str, ""); }
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char* cm_trimstart(const char* str){
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	int i;
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	for(i = 0; str[i] != 0; i++){
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		if(str[i] != ' ' && str[i] != '\t'){
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			return cm_strdup(str + i);
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		}
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	}
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	return cm_strdup("");
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}
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char* cm_trimend(const char* str){
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	char* s = cm_strdup(str);
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	int i;
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	for(i = strlen(s) - 1; i >= 0; i--){
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		if(s[i] != '\t' && s[i] != ' '){
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			s[i + 1] = 0;
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			break;
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		}
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	}
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	return s;
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}
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char* cm_trim(const char* str){
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	char* tmp = cm_trimstart(str);
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	char* s = cm_trimend(tmp);
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	free(tmp);
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	return s;
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}
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char** cm_split(const char* str, const char* by){
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	int i;
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	char** r = malloc(sizeof(*r));
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	r[0] = NULL;
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	char* b = malloc(1);
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	b[0] = 0;
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	char cbuf[2];
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	cbuf[1] = 0;
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	bool dq = false;
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	bool sq = false;
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	for(i = 0;; i++){
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		int j;
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		bool has = false;
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		for(j = 0; by[j] != 0; j++){
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			if(by[j] == str[i]){
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				has = true;
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				break;
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			}
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		}
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		if(!(dq || sq) && (has || str[i] == 0)){
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			if(strlen(b) > 0){
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				char** old = r;
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				int j;
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				for(j = 0; old[j] != NULL; j++);
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				r = malloc(sizeof(*r) * (j + 2));
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				for(j = 0; old[j] != NULL; j++) r[j] = old[j];
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				r[j] = b;
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				r[j + 1] = NULL;
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				free(old);
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			}
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			b = malloc(1);
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			b[0] = 0;
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			if(str[i] == 0) break;
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		}else{
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			if(str[i] == '"' && !sq){
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				dq = !dq;
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			}else if(str[i] == '\'' && !dq){
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				sq = !sq;
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			}else{
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				cbuf[0] = str[i];
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				char* tmp = b;
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				b = cm_strcat(tmp, cbuf);
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				free(tmp);
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			}
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		}
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	}
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	free(b);
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	return r;
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}
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bool cm_strcaseequ(const char* a, const char* b){
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	if(a == NULL) return false;
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	if(b == NULL) return false;
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	if(strlen(a) != strlen(b)) return false;
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	int i;
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	for(i = 0; a[i] != 0; i++){
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		if(tolower(a[i]) != tolower(b[i])) return false;
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	}
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	return true;
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}