string/test/stringtest.h

/*
 * Common string test code.
 *
 * Copyright (c) 2020, Arm Limited.
 * SPDX-License-Identifier: MIT
 */

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

/* Accounting errors for a test case.  */
static int err_count;
#define ERR_LIMIT 10
#define ERR(...) (err_count++, printf(__VA_ARGS__))

static inline void quotechar(unsigned char c)
{
	if (isprint(c))
		putchar(c);
	else
		printf("\\x%02x", c);
}

/* quoted print around at or the entire string if at < 0.  */
static void quoteat(const char *prefix, const void *p, int len, int at)
{
	static const int CTXLEN = 15;
	int i;
	const char *pre="\"";
	const char *post="\"";
	const char *s = p;
	if (at > CTXLEN) {
		s += at - CTXLEN;
		len -= at - CTXLEN;
		pre = "...\"";
	}
	if (at >= 0 && len > 2*CTXLEN + 1) {
		len = 2*CTXLEN + 1;
		post = "\"...";
	}
	printf("%4s: %s", prefix, pre);
	for (i = 0; i < len; i++)
		quotechar(s[i]);
	printf("%s\n", post);
}

static inline void quote(const char *prefix, const void *p, int len)
{
	quoteat(prefix, p, len, -1);
}