debug-example.tex

\chapter{Программа debug_example.c}\label{chap:debug-example}

\begin{lstlisting}
/*
 * This program  reads input and converts it to uppercase.
 * It has an intentional bug included that makes it crash on certain inputs.
 * 
 * Usage: stdin - input string.
 * Compile with gcc -static -g debug_example.c -o debug_example
 */
	
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

void read_input(char* in) {
    char symbol;
    in[0] = 0; // initialize the string with zero length
    while((symbol = getchar()) != EOF) {
        *in++ = symbol;
    }
    *in = 0; // close the string
}

void convert_to_uppercase(char * in, char *out) {
    int i;
    for (i =0; i <= strlen(in); i++) {
        if (isalpha(in[i]))
            out[i] = toupper(in[i]);
        else
            out[i] = in[i];
    }
}

int main(int argc, char** argv) {
    char input[32], *output;
    
    read_input(input);
    convert_to_uppercase(input, output);
    
    printf("%s\n", output);
    return 0;
}
\end{lstlisting}