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2 nishi 1 
/* $Id: util.c 4 2024-09-11 10:22:22Z nishi $ */
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#include "kn_util.h"
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#include <string.h>
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#include <stdlib.h>
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char* kn_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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4 nishi 16 
char* kn_strcat3(const char* a, const char* b, const char* c) {
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	char* tmp = kn_strcat(a, b);
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	char* str = kn_strcat(tmp, c);
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	free(tmp);
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	return str;
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}
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char* kn_strdup(const char* a) { return kn_strcat(a, ""); }