string.c

来自「串口代理」· C语言 代码 · 共 71 行

/*
 * string.c
 *
 * string handling routines
 *
 * (C)1999 Stefano Busti
 *
 */

#include <stdlib.h>
#include <string.h>

#include "string.h"

int str_assign(char **pstr, char *text)
{
	char *p;
	
	if (!text)
	{
		free(*pstr);
		*pstr = NULL;
		return 0;
	}

	p = realloc(*pstr, strlen(text) + 1);
	if (!p)
		return -1;
	*pstr = p;
	strcpy(p, text);
	
	return 0;
}

int str_cat(char **pstr, char *text)
{
	char *p = realloc(*pstr, strlen(*pstr) + strlen(text) + 1);
	if (!p)
		return -1;

	*pstr = p;
	strcat(p, text);

	return 0;
}

/* strips trailing spaces */
int str_striptrail(char *str)
{
	char *p;
	
	for (p = str + strlen(str) - 1; p >= str; p--)
	{
		if (*p != ' ')
		{
			*(p + 1) = '\0';
			return 0;
		}
	}
	return 0;
}

void str_cleanup(char **pstr)
{
	if (*pstr)
	{
		free(*pstr);
		*pstr = NULL;
	}
}