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5 nishi 1 
/* $Id: util.c 7 2024-08-25 20:49:55Z nishi $ */
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#include "is_util.h"
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#include <string.h>
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#include <stdlib.h>
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char* is_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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}
7 nishi 15 
 
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char* is_strcat3(const char* a, const char* b, const char* c) {
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	char* tmp = is_strcat(a, b);
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	char* str = is_strcat(tmp, c);
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	free(tmp);
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	return str;
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}
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char* is_strdup(const char* str) { return is_strcat(str, ""); }