xref: /kvmtool/util/util.c (revision 0b322d9635196147295807a190d07fde072cc70c)

/*
 * Taken from perf which in turn take it from GIT
 */

#include "kvm/util.h"

static void report(const char *prefix, const char *err, va_list params)
{
	char msg[1024];
	vsnprintf(msg, sizeof(msg), err, params);
	fprintf(stderr, " %s%s\n", prefix, msg);
}

static NORETURN void die_builtin(const char *err, va_list params)
{
	report(" Fatal: ", err, params);
	exit(128);
}

static void error_builtin(const char *err, va_list params)
{
	report(" Error: ", err, params);
}

static void warn_builtin(const char *warn, va_list params)
{
	report(" Warning: ", warn, params);
}

static void info_builtin(const char *info, va_list params)
{
	report(" Info: ", info, params);
}

void die(const char *err, ...)
{
	va_list params;

	va_start(params, err);
	die_builtin(err, params);
	va_end(params);
}

int error(const char *err, ...)
{
	va_list params;

	va_start(params, err);
	error_builtin(err, params);
	va_end(params);
	return -1;
}

void warning(const char *warn, ...)
{
	va_list params;

	va_start(params, warn);
	warn_builtin(warn, params);
	va_end(params);
}

void info(const char *info, ...)
{
	va_list params;

	va_start(params, info);
	info_builtin(info, params);
	va_end(params);
}

void die_perror(const char *s)
{
	perror(s);
	exit(1);
}

/**
 * strlcat - Append a length-limited, %NUL-terminated string to another
 * @dest: The string to be appended to
 * @src: The string to append to it
 * @count: The size of the destination buffer.
 */
size_t strlcat(char *dest, const char *src, size_t count)
{
	size_t dsize = strlen(dest);
	size_t len = strlen(src);
	size_t res = dsize + len;

	DIE_IF(dsize >= count);

	dest += dsize;
	count -= dsize;
	if (len >= count)
		len = count - 1;

	memcpy(dest, src, len);
	dest[len] = 0;

	return res;
}