util_str.c

Linux snort-2.4.4源代码

/**
 * @file   util_str.c
 * @author Chris Green <[e-mail]>
 * @date   Fri Jun 27 10:41:59 2003
 * 
 * @brief  utility string functions
 * 
 * 
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif


#include "util_str.h"
#include <stdlib.h>
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif

/** 
 * Convert a string to an int and check for problems
 * 
 * @param str string to parse as an int
 * @param ret return value for the int
 * @param allow_negative allow negative values 
 * 
 * @return 0 on sucess, else failure
 */
int str2int(char *str, int *ret, int allow_negative)
{
    char *endptr;
    long int value;

    if(ret && str && *str != '\0')
    {
        value = strtol(str, &endptr, 10);

        if(endptr == str)
        {
            /* parsing has failed */
            return -1;
        }

        if(!allow_negative)
        {
            if(value < 0)
            {
                return -1;
            }
        }

        *ret = value;
           
        return 0;
    }

    return -1;
}

/** 
 * Set opt_value to 1 if the value is on, 0 if it's off
 * 
 * @param name option name to configure (not used but useful for debugging)
 * @param value value to configure (should be either on or off )
 * @param opt_value ptr to integer to configure
 *
 * @returns 0 on success , else failure
 */
int toggle_option(char *name, char *value, int *opt_value)
{
    int opt_on, opt_off;
    
    if(!name || !value || !opt_value || (*value == '\0') || (*name == '\0') )
        return -1;

    opt_on  = strcasecmp(value,"on");
    opt_off = strcasecmp(value,"off");

    if(opt_off && opt_on)
    {
        /*
	 * the string is neither "on" or "off"
	 *
	 * we don't know what the hell we're looking at. return error.
	 */
        return -2;
    }

    if(opt_on == 0)
        *opt_value = 1;
    else
        *opt_value = 0;

    return 0;
}


#ifdef TEST_UTIL_STR
int main(void)
{
    int value;

    printf("you should see 4 pass messages\n");

    if(str2int("-1",&value,0) != 0)
        printf("test 1 passed and failed to parse\n");

    if(str2int("-1",&value,1) == 0 && value == -1)
        printf("test 2 passed: %d\n", value);

    if(str2int("0",&value,1) == 0 && value == 0 )
        printf("test 3 passed: %d\n", value);
    
    if(str2int("124",&value,1) == 0 && value == 124 )
        printf("test 4 passed: %d\n", value);


    
    
    
    
}
#endif /* TEST_UTIL_STR */