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Date: Sun, 3 Jan 2010 16:26:38 -0500 (EST)
From: Jude DaShiell <jdashiel AT shellworld DOT net>
To: djgpp AT delorie DOT com
Subject: gcc ching.c compile failed
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>

#define ICHING_PATH "/usr/local/lib/ching.txt"

void cast(char *hexagram)
{
 	int sum, c, i;

 	sum = 0;
 	while ((c = getchar()) != EOF) sum += c;
 	srandom(sum + getuid() + getgid() + getpid() + time(0));
 	for (i = 0; i < 6; i++) {
 		sum = 2 + ((random() >> 15) & 1);
 		sum += 2 + ((random() >> 15) & 1);
 		sum += 2 + ((random() >> 15) & 1);
 		hexagram[i] = '0' + sum;
 	}
}

int changing(char *hexagram)
{
 	int i;

 	for (i = 0; i < 6; i++) if (hexagram[i] == '6' || hexagram[i] == '9') return 1;
 	return 0;
}

void change(char *hexagram)
{
 	int i;

 	for (i = 0; i < 6; i++) {
 		if (hexagram[i] == '6') hexagram[i] = '7';
 		if (hexagram[i] == '9') hexagram[i] = '8';
 	}
}

int number(char *hexagram)
{
 	int i, h = 0;
 	static char hnum[64] = {
 		  2, 24,  7, 19, 15, 36, 46, 11,
 		 16, 51, 40, 54, 62, 55, 32, 34,
 		  8,  3, 29, 60, 39, 63, 48,  5,
 		 45, 17, 47, 58, 31, 49, 28, 43,
 		 23, 27,  4, 41, 52, 22, 18, 26,
 		 35, 21, 64, 38, 56, 30, 50, 14,
 		 20, 42, 59, 61, 53, 37, 57,  9,
 		 12, 25,  6, 10, 33, 13, 44,  1
 	};

 	for (i = 0; i < 6; i++) if (hexagram[i] == '7' || hexagram[i] == '9') h += 1 << i;
 	return hnum[h];
}

void print(char *hexagram)
{
 	FILE *text;
 	char line[80], top[8];
 	int i = -3, echo = 0;

 	if ((text = fopen(ICHING_PATH, "r")) == 0) {
 		perror(ICHING_PATH);
 		exit(1);
 	}

 	sprintf(top, "%d.  ", number(hexagram));
 	fputs("\n", stdout);
 	while (fgets(line, sizeof(line), text) != 0) {
 		if (*line == '\f') *line = '\n';
 		if (i == -3) {
 			if (strstr(line, top) != 0 && strstr(line, " / ") != 0) echo = 1, i++;
 		}
 		else if (i == -2) {
 			if (strstr(line, "The Lines") != 0)
 				if (!changing(hexagram)) break;
 				else i++;
 		}
 		else {
 			if (*line == '\n') i++;
 			if (i < 6) echo = (hexagram[i] == '6' || hexagram[i] == '9');
 			else if (memcmp(hexagram, "666666", 6) && memcmp(hexagram, "999999", 6) || i > 6) break;
 		}
 		if (echo) fputs(line, stdout);
 	}
 	fclose(text);
}

int main(int argc, char *argv[])
{
 	int i;
 	char hexagram[6];

 	if (argc == 1) {
 		cast(hexagram);
 		i = 6;
 	}
 	else for (i = 0; i < 6 && argv[1][i] >= '6' && argv[1][i] <= '9'; i++) hexagram[i] = argv[1][i];
 	if (argc > 2 || i < 6) {
 		fprintf(stderr, "usage: %s [hexagram]\n", argv[0]);
 		exit(1);
 	}
 	print(hexagram);
 	if (changing(hexagram)) {
 		fputs("\n", stdout);
 		change(hexagram);
 		print(hexagram);
 	}
 	return 0;
} This program compiles correctly with gcc.  gcc ching.c -o ching <cr>. 
The only output this program generates is the useage message.  I have 
ching.txt located in /usr/local/lib/ching.txt.  What has me puzzled is why 
no other output is available.  Is this a program that needs a different 
compiler?  I can build it with Power C if need be but if such a build 
produces more output, what is the difference that makes gcc work in this 
way?