nato_file_translator.c

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

char isterm(char *term)
{
    const char *nato[] = {
        "Alfa", "Bravo", "Charlie", "Delta", "Echo", "Foxtrot",
        "Golf", "Hotel", "India", "Juliett", "Kilo", "Lima",
        "Mike", "November", "Oscar", "Papa", "Quebec", "Romeo",
        "Sierra", "Tango", "Uniform", "Victor", "Whiskey",
        "Xray", "Yankee", "Zulu"};
    int x;
    const char *n;
    char *t;

    for (x = 0; x < 26; x++)
    {
        n = nato[x];
        t = term;
        while (*n != '\0')
        {
            if ((*n | 0x20) != (*t | 0x20))
                break;
            n++;
            t++;
        }
        if (*n == '\0')
            return (*nato[x]);
    }
    return ('\0');
}

int main(int argc, char *argv[])
{
    FILE *n;
    char word[64];
    int ch, offset;

    if (argc < 2)
    {
        fprintf(stderr, "Please supply a text file arguments\n");
        exit(1);
    }

    n = fopen(argv[1], "r");
    if (n == NULL)
    {
        fprintf(stderr, "Unable to open '%s'\n", argv[1]);
        exit(1);
    }

    offset = 0;
    while ((ch = fgetc(n)) != EOF)
    {
        if (isalpha(ch))
        {
            word[offset] = ch;
            offset++;
            if (offset >= 64)
            {
                fprintf(stderr, "Buffer overflow\n");
                return (1);
            }
        }
        else
        {
            if (offset > 0)
            {
                word[offset] = '\0';
                putchar(isterm(word));
                offset = 0;
            }
        }
    }
    putchar('\n');

    fclose(n);

    return (0);
}