isValidInt.c

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#include <genutils.h>
 
#include <ctype.h>
 
int isValidInt(const char* str) {
 
    // Handle leading sign character.
    //
    if (*str == '-')
        str++;
    else if (*str == '+')
        str++;
 
    // Handle empty string or just "-" or "+"
    //
    if (!*str)
        return 0;
 
    // Check for non-digit chars in the rest of the stirng.
    //
    while (*str) {
        if (isdigit(*str))
            str++;
        else
            return 0;
    }
 
    return 1;
}