aosp12/external/strace/tests/print_quoted_string.c

#include "tests.h"

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

/*
 * Based on string_quote() from util.c.
 * Assumes instr is NUL-terminated.
 */

void
print_quoted_string_ex(const char *instr, bool quote, const char *escape_chars)
{
	print_quoted_memory_ex(instr, strlen(instr), quote, escape_chars);
}

void
print_quoted_string(const char *instr)
{
	print_quoted_memory(instr, strlen(instr));
}

void
print_quoted_cstring(const char *instr, const size_t size)
{
	const size_t len = strnlen(instr, size);
	if (len < size) {
		print_quoted_memory(instr, len);
	} else {
		print_quoted_memory(instr, size - 1);
		printf("...");
	}
}

void
print_quoted_stringn(const char *instr, const size_t size)
{
	const size_t len = strnlen(instr, size);
	if (len < size) {
		print_quoted_memory(instr, len);
	} else {
		print_quoted_memory(instr, size);
		printf("...");
	}
}

static void
print_octal(unsigned char c, char next)
{
	putchar('\\');

	char c1 = '0' + (c & 0x7);
	char c2 = '0' + ((c >> 3) & 0x7);
	char c3 = '0' + (c >> 6);

	if (next >= '0' && next <= '7') {
		/* Print \octal */
		putchar(c3);
		putchar(c2);
	} else {
		/* Print \[[o]o]o */
		if (c3 != '0')
			putchar(c3);
		if (c3 != '0' || c2 != '0')
			putchar(c2);
	}
	putchar(c1);
}

void
print_quoted_memory_ex(const void *const instr, const size_t len,
		       bool quote, const char *escape_chars)
{
	const unsigned char *str = (const unsigned char *) instr;
	size_t i;

	if (quote)
		putchar('"');

	for (i = 0; i < len; ++i) {
		const int c = str[i];
		switch (c) {
			case '\"':
				printf("\\\"");
				break;
			case '\\':
				printf("\\\\");
				break;
			case '\f':
				printf("\\f");
				break;
			case '\n':
				printf("\\n");
				break;
			case '\r':
				printf("\\r");
				break;
			case '\t':
				printf("\\t");
				break;
			case '\v':
				printf("\\v");
				break;
			default:
				if (c >= ' ' && c <= 0x7e &&
				    !(escape_chars && strchr(escape_chars, c))) {
					putchar(c);
				} else {
					print_octal(c,
						i < (len - 1) ? str[i + 1] : 0);
				}

				break;
		}
	}

	if (quote)
		putchar('"');
}

void
print_quoted_memory(const void *const instr, const size_t len)
{
	print_quoted_memory_ex(instr, len, true, NULL);
}

void
print_quoted_hex(const void *const instr, const size_t len)
{
	const unsigned char *str = instr;
	size_t i;

	printf("\"");
	for (i = 0; i < len; i++)
		printf("\\x%02x", str[i]);
	printf("\"");
}