mylib.c

#include <stdio.h>  /* for fprintf */
#include <stdlib.h> /* for size_t, malloc, realloc, exit */
#include "mylib.h"
#include <ctype.h>
#include <assert.h>

void *emalloc(size_t s)
{
    void *result = malloc(s);
    if (NULL == result)
    {
        fprintf(stderr, "Memory allocation failed!\n");
        exit(EXIT_FAILURE);
    }
    return result;
}

void *erealloc(void *p, size_t s)
{
    void *result = realloc(p, s);
    if (NULL == result)
    {
        fprintf(stderr, "memory reallocation failed.\n");
        exit(EXIT_FAILURE);
    }
    else
    {
        return result;
    }
}

int getword(char *s, int limit, FILE *stream)
{
    int c;
    char *w = s;
    assert(limit > 0 && s != NULL && stream != NULL);
    /* skip to the start of the word */
    while (!isalnum(c = getc(stream)) && EOF != c)
        ;
    if (EOF == c)
    {
        return EOF;
    }
    else if (--limit > 0)
    { /* reduce limit by 1 to allow for the \0 */
        *w++ = tolower(c);
    }
    while (--limit > 0)
    {
        if (isalnum(c = getc(stream)))
        {
            *w++ = tolower(c);
        }
        else if ('\'' == c)
        {
            limit++;
        }
        else
        {
            break;
        }
    }
    *w = '\0';
    return w - s;
}