Compare two strings by soundex values in c

#include
#include

#define MAXLINE 1024

int sndxcode[26];
char *sndxgrp[] = { "aeiouhyw", "kcgjqsxz", "td",
"bpfv", "l", "mn", "r" };

void locsndx(char *, int *, char);
int cmpcodes(int *, int *);
int cmpsndx(char *, char *);

int main(int argc, char *argv[]) {
char *ptr = NULL;
int i = 0;

if(argc != 3)
error(1, 0, "string1 string2");

for(i = sizeof(sndxgrp) / sizeof(char *) - 1; i >= 0; i--)
for(ptr = sndxgrp[i]; *ptr; ptr++)
sndxcode[*ptr - 'a'] = i;

printf("%d\n", cmpsndx(argv[1], argv[2]));

return 0;
}

void locsndx(char *str, int *sndx, char lastchar) {
if(0 == *str)
*sndx = -1, lastchar = 0;
else if(*str == lastchar)
locsndx(str + 1, sndx, lastchar);
else if(-1 == lastchar)
*sndx = sndxcode[*str - 'a'], locsndx(str + 1, sndx + 1, *str);
else if(sndxcode[*str - 'a'] == 0)
locsndx(str + 1, sndx, *str);
else
*sndx = sndxcode[*str - 'a'], locsndx(str + 1, sndx + 1, *str);

return;
}

int cmpcodes(int *sndx1, int *sndx2) {
int *ptr1 = sndx1;
int *ptr2 = sndx2;

for(; *ptr1 != -1 && *ptr2 != -1 && *ptr1 == *ptr2; ptr1++, ptr2++)
;

return *ptr1 == *ptr2;
}

int cmpsndx(char *str1, char *str2) {
int sndx1[MAXLINE] = {0};
int sndx2[MAXLINE] = {0};

locsndx(str1, sndx1, -1);
locsndx(str2, sndx2, -1);

return cmpcodes(sndx1, sndx2);
}

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