tools/perf/util/color.c

Source file repositories/reference/linux-study-clean/tools/perf/util/color.c

File Facts

System
Linux kernel
Corpus path
tools/perf/util/color.c
Extension
.c
Size
3395 bytes
Lines
157
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <subcmd/pager.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "color.h"
#include <math.h>
#include <unistd.h>

int perf_use_color_default = -1;

static int __color_vsnprintf(char *bf, size_t size, const char *color,
			     const char *fmt, va_list args, const char *trail)
{
	int r = 0;

	/*
	 * Auto-detect:
	 */
	if (perf_use_color_default < 0) {
		if (isatty(1) || pager_in_use())
			perf_use_color_default = 1;
		else
			perf_use_color_default = 0;
	}

	if (perf_use_color_default && *color)
		r += scnprintf(bf, size, "%s", color);
	r += vscnprintf(bf + r, size - r, fmt, args);
	if (perf_use_color_default && *color)
		r += scnprintf(bf + r, size - r, "%s", PERF_COLOR_RESET);
	if (trail)
		r += scnprintf(bf + r, size - r, "%s", trail);
	return r;
}

/* Colors are not included in return value */
static int __color_vfprintf(FILE *fp, const char *color, const char *fmt,
		va_list args)
{
	int r = 0;

	/*
	 * Auto-detect:
	 */
	if (perf_use_color_default < 0) {
		if (isatty(fileno(fp)) || pager_in_use())
			perf_use_color_default = 1;
		else
			perf_use_color_default = 0;
	}

	if (perf_use_color_default && *color)
		fprintf(fp, "%s", color);
	r += vfprintf(fp, fmt, args);
	if (perf_use_color_default && *color)
		fprintf(fp, "%s", PERF_COLOR_RESET);
	return r;
}

int color_vsnprintf(char *bf, size_t size, const char *color,
		    const char *fmt, va_list args)
{
	return __color_vsnprintf(bf, size, color, fmt, args, NULL);
}

int color_vfprintf(FILE *fp, const char *color, const char *fmt, va_list args)
{
	return __color_vfprintf(fp, color, fmt, args);
}

int color_snprintf(char *bf, size_t size, const char *color,
		   const char *fmt, ...)
{
	va_list args;
	int r;

	va_start(args, fmt);
	r = color_vsnprintf(bf, size, color, fmt, args);
	va_end(args);
	return r;
}

int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
{
	va_list args;
	int r;

	va_start(args, fmt);

Annotation

Implementation Notes