#include <stdio.h>
    #include <string.h> //strlen
 
    int main()
    {
        // para loop "for"
        int i;
 
        // area de entrada
        char hex[] = "0x6F0x69";
        int sizeHex = strlen(hex);
 
        // area de saida
        char text[10];
 
        // ponteiro para area de saida
        char* pText = text;
 
        // area de trabalho, vai ser usada com scanf --> vai 0x6F, depois 0x69, etc
        char tmp[5];
 
        // variavel de conveniencia
        int ch;
 
        tmp[4] = 0; // paa delimitar string de trabalho
 
        // trata todos os caracteres da area de entrada
        // anda de 4 em 4 porque cada caracter esta' codificado como "0xNN"
        for (i = 0; i < sizeHex; i += 4)
        {
           memcpy(tmp, hex+i, 4);
           sscanf(tmp, "%x", &ch);
 
           // transfere para area de saida, e avanca ponteiro na area de saida
           *pText++ = (char)ch;
        }
 
        *pText = 0; // para delimitar string
 
        printf("string convertida: %s\n",text);
    }
 
 

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1