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3 nishi 1 
/* $Id: util.c 11 2024-08-30 05:20:32Z nishi $ */
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#include "ia_util.h"
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#include <stdlib.h>
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#include <string.h>
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char* ia_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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11 nishi 16 
char* ia_strcat3(const char* a, const char* b, const char* c) {
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	char* tmp = ia_strcat(a, b);
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	char* str = ia_strcat(tmp, c);
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	free(tmp);
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	return str;
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}
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char* ia_strcat4(const char* a, const char* b, const char* c, const char* d) {
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	char* tmp = ia_strcat3(a, b, c);
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	char* str = ia_strcat(tmp, d);
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	free(tmp);
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	return str;
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}
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3 nishi 30 
char* ia_strdup(const char* str) { return ia_strcat(str, ""); }