hardio.c

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/* Low-level terminal-suitable I/O routines */
/* $Id: hardio.c,v 1.14 2004/10/13 15:34:47 zas Exp $ */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include "elinks.h"

#include "terminal/hardio.h"
#include "util/error.h"

/* Define it to have data written to stderr */
/* #define DEBUG_HARDIO */

#undef debug_open
#undef debug_flush
#undef debug_write

#ifdef DEBUG_HARDIO
static void
hw_debug_open(unsigned char *name, int fd, unsigned char *p, int l)
{
	fprintf(stderr, "[%s (fd=%d, p=%p, l=%d)]\n",name, fd, p, l);
}

static void
hw_debug_flush() {
	fputs("\n\n", stderr);
	fflush(stderr);
}

static void
hw_debug_write(unsigned char *p, int w)
{
	int hex = 0;
	int i = 0;

	if (!w) return;

	for (; i < w; i++) {
		if (p[i] == ' ') {
			int c = i;

			while (i < w && p[++i] == ' ');

			if (i - c - 1 > 1) {
				fprintf(stderr, "[+ %d spaces]\n", i - c - 1);
				if (i == w) break;
				c = 0;
				continue;
			}
			c = 0;
			i--;
		}

		if (p[i] >= ' ' && p[i] < 127 && p[i] != '|') {
			if (hex) {
				fputc('|', stderr);
				hex = 0;
			}
			fputc(p[i], stderr);
		} else {
			if (!hex) {
				fputc('|', stderr);
				hex = 1;
			}
			fprintf(stderr,"%02x", p[i]);
		}
	}
}
#define debug_open(n, fd, p, l) hw_debug_open(n, fd, p, l)
#define debug_flush() hw_debug_flush()
#define debug_write(p, l) hw_debug_write(p, l)
#else
#define debug_open(n, fd, p, l)
#define debug_flush()
#define debug_write(p, l)
#endif


int
hard_write(int fd, unsigned char *p, int l)
{
	int t = l;

	assert(p && l >= 0);
	if_assert_failed return -1;

	debug_open("hard_write", fd, p, l);

	while (l > 0) {
		int w = safe_write(fd, p, l);

		if (w <= 0) {
			if (w) return -1;
			break;
		}

		debug_write(p, w);

		p += w;
		l -= w;
	}

	debug_flush();

	/* Return number of bytes written. */
	return (t - l);
}

int
hard_read(int fd, unsigned char *p, int l)
{
	int t = l;

	assert(p && l >= 0);
	if_assert_failed return -1;

	debug_open("hard_read", fd, p, l);

	while (l > 0) {
		int r = safe_read(fd, p, l);

		if (r <= 0) {
			if (r) return -1;
			break;
		}

		debug_write(p, r);

		p += r;
		l -= r;
	}

	debug_flush();

	/* Return number of bytes read. */
	return (t - l);
}