Thread: WRONG OUTPUT, i need help today pls :)

Code:

#include<stdio.h> 
#define MAXL 256 
 
// funcoes pos e inv 
 
int mystrlen(char *string) { // My String Lenght - returns string lenght 
    int len = 0;  
    while(*(string+len)!='\0') { 
      len++; 
    } 
    return len; 
} 
 
char* inv(char* C) { // REVERSE C and returns C reversed 
    int length, i; 
    char *begin; 
    char *end; 
    char temp;  
    length = mystrlen(C); 
    begin = C;              
    end = C;             
    end += length-1;     
    for (i=0;i<length/2;i++) {         
        temp = *end; 
        *end = *begin; 
        *begin = temp; 
        begin++; 
        end--; 
    } 
    return C; 
} 
 
char* pos(char* C,char* S) { // FIND C in S and returns a pointer for a char that contains the positions where C is in S 
    int CAux = 0; int csize = mystrlen(C); 
    int SAux = 0; int ssize = mystrlen(S); 
    int howMany = 1; 
    char results[ssize];
    char* r = results; 
    int i;  
    for(i=0;i<ssize;i++){ 
        if(C[CAux] == S[i]){ 
            SAux = i; 
            while((C[CAux]==S[SAux]) && (CAux<(csize-1))){ 
                CAux++; 
                SAux++; 
                howMany++; 
                if(howMany == (csize-1)){ 
                    sprintf(results + mystrlen(results), " %d", i); 
                } 
            } 
            SAux = i + 1; 
            CAux = 0; 
            howMany = 0; 
        }
         
    } 
    return r; 
} 
 
 
/* _-*_-*_-*_-*_-* MAIN *-_*-_*-_*-_*-_ */ 
 
int main(int argc, char *argv[]) {     
    char str[MAXL]; 
    char *r=str;     
    // declarar aqui outras variaveis, se necessario (another var.) 
    char *compStr;
    char* res; 
    while(r!=NULL) { 
        r=fgets(str,MAXL,stdin);
 
        // chamar a funcao pos() ou inv(), conforme o caso (call pos() or inv()) 
        if(argv[1][0] == 'p') { // pos() 
            compStr = argv[2];            
            res = pos(compStr, r); 
        }     
        else if(argv[1][0] == 'i') { // inv()
            res = inv(r); 
        } 
         
        // imprimir os resultados (Print results) 
        printf("%s\n",res);         
    } 
    return 0; 
}

on running this program:

1 ____ "i"

if you do ./cadeias i: (inv function that reverses C)
you will able to write a string to return the reverse.

ex: ./cadeias i (enter)
Pedro
out -> ordeP

2 _____ "p"

if you do ./cadeias p anystring: (pos function that finds C in S)
you will be able to write a sting to find in "anystring" and returns the posicions that the sub string are.

ex: ./cadeias p PETER
E
out -> 2 4

but, its printing things like that: "pYS�����"

can you help me finding where is the problem???