Advanced string comparison

Hi guys,

I need to find a way to compare two strings which include numbers within.
The standard "strcmp" don't exclude numbers, so "a101" < "a12".

Are you familiar with an implementation which sloves it?

Regards,
Mapisto.

Do you want to compare numbers after ONE character? If this is the case, you can just have a pointer that points to second character's address and perform atoi/l:

Code:

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char sourcestr1[] = "a101", sourcestr2[] = "a12";
int a,b;
char *p;
p=sourcestr1 + 1;
a=atol(p);
b=atol(sourcestr2 + 1);
if(a>b)...

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Of course not, I meant to more general solution. So, i've overcomed my laziness and eventually coded it:

Code:

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



int strnumcmp( const char* str1, const char* str2 )
{
        unsigned int str1len = strlen(str1);
        unsigned int str2len = strlen(str2);
        unsigned long res1 = 0, res2 =0;
        char *stopstring1, *stopstring2;
        for(unsigned int i =0; i < str1len; i++) {
                if (i > str2len)
                        return 1;

                if (isdigit(str1[i]) &&  isdigit(str2[i]))
                {
                        res1 = strtoul(&str1[i], &stopstring1, 10);
                        str1 = stopstring1;
                        str1len = strlen(stopstring1);
                        res2 = strtoul(&str2[i], &stopstring2, 10);
                        str2 = stopstring2;
                        str1len = strlen(stopstring1);
                        if (res1 > res2)
                                return 1;
                        else if ( res1 < res2)
                                return -1;
                        i = 0;
                        continue;
                }

                if (str1[i] > str2[i]) {
                        return 1;
                }
                else if(str1[i] < str2[i] ) {
                        return -1;
                }

        }
        return 0;
}

int main( char **argv, int argc ) {
        const  char* str1 = "e110xy";
        const  char* str2 = "e110xy";
       
        printf( "%d\n", strnumcmp(str1,str2) );

        return 0;
}

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enjoy.

Code:

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int main( char **argv, int argc ) {

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Which compiler you are using? :D

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