tools/perf/util/color.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/kernel.h>
   3 #include <subcmd/pager.h>
   4 #include <stdlib.h>
   5 #include <stdio.h>
   6 #include <string.h>
   7 #include "color.h"
   8 #include <math.h>
   9 #include <unistd.h>
  10
  11 int perf_use_color_default = -1;
  12
  13 static int __color_vsnprintf(char *bf, size_t size, const char *color,
  14                              const char *fmt, va_list args, const char *trail)
  15 {
  16         int r = 0;
  17
  18         /*
  19          * Auto-detect:
  20          */
  21         if (perf_use_color_default < 0) {
  22                 if (isatty(1) || pager_in_use())
  23                         perf_use_color_default = 1;
  24                 else
  25                         perf_use_color_default = 0;
  26         }
  27
  28         if (perf_use_color_default && *color)
  29                 r += scnprintf(bf, size, "%s", color);
  30         r += vscnprintf(bf + r, size - r, fmt, args);
  31         if (perf_use_color_default && *color)
  32                 r += scnprintf(bf + r, size - r, "%s", PERF_COLOR_RESET);
  33         if (trail)
  34                 r += scnprintf(bf + r, size - r, "%s", trail);
  35         return r;
  36 }
  37
  38 /* Colors are not included in return value */
  39 static int __color_vfprintf(FILE *fp, const char *color, const char *fmt,
  40                 va_list args)
  41 {
  42         int r = 0;
  43
  44         /*
  45          * Auto-detect:
  46          */
  47         if (perf_use_color_default < 0) {
  48                 if (isatty(fileno(fp)) || pager_in_use())
  49                         perf_use_color_default = 1;
  50                 else
  51                         perf_use_color_default = 0;
  52         }
  53
  54         if (perf_use_color_default && *color)
  55                 fprintf(fp, "%s", color);
  56         r += vfprintf(fp, fmt, args);
  57         if (perf_use_color_default && *color)
  58                 fprintf(fp, "%s", PERF_COLOR_RESET);
  59         return r;
  60 }
  61
  62 int color_vsnprintf(char *bf, size_t size, const char *color,
  63                     const char *fmt, va_list args)
  64 {
  65         return __color_vsnprintf(bf, size, color, fmt, args, NULL);
  66 }
  67
  68 int color_vfprintf(FILE *fp, const char *color, const char *fmt, va_list args)
  69 {
  70         return __color_vfprintf(fp, color, fmt, args);
  71 }
  72
  73 int color_snprintf(char *bf, size_t size, const char *color,
  74                    const char *fmt, ...)
  75 {
  76         va_list args;
  77         int r;
  78
  79         va_start(args, fmt);
  80         r = color_vsnprintf(bf, size, color, fmt, args);
  81         va_end(args);
  82         return r;
  83 }
  84
  85 int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
  86 {
  87         va_list args;
  88         int r;
  89
  90         va_start(args, fmt);
  91         r = color_vfprintf(fp, color, fmt, args);
  92         va_end(args);
  93         return r;
  94 }
  95
  96 const char *get_percent_color(double percent)
  97 {
  98         const char *color = PERF_COLOR_NORMAL;
  99
 100         /*
 101          * We color high-overhead entries in red, mid-overhead
 102          * entries in green - and keep the low overhead places
 103          * normal:
 104          */
 105         if (fabs(percent) >= MIN_RED)
 106                 color = PERF_COLOR_RED;
 107         else {
 108                 if (fabs(percent) > MIN_GREEN)
 109                         color = PERF_COLOR_GREEN;
 110         }
 111         return color;
 112 }
 113
 114 int percent_color_fprintf(FILE *fp, const char *fmt, double percent)
 115 {
 116         int r;
 117         const char *color;
 118
 119         color = get_percent_color(percent);
 120         r = color_fprintf(fp, color, fmt, percent);
 121
 122         return r;
 123 }
 124
 125 int value_color_snprintf(char *bf, size_t size, const char *fmt, double value)
 126 {
 127         const char *color = get_percent_color(value);
 128         return color_snprintf(bf, size, color, fmt, value);
 129 }
 130
 131 int percent_color_snprintf(char *bf, size_t size, const char *fmt, ...)
 132 {
 133         va_list args;
 134         double percent;
 135
 136         va_start(args, fmt);
 137         percent = va_arg(args, double);
 138         va_end(args);
 139         return value_color_snprintf(bf, size, fmt, percent);
 140 }
 141
 142 int percent_color_len_snprintf(char *bf, size_t size, const char *fmt, ...)
 143 {
 144         va_list args;
 145         int len;
 146         double percent;
 147         const char *color;
 148
 149         va_start(args, fmt);
 150         len = va_arg(args, int);
 151         percent = va_arg(args, double);
 152         va_end(args);
 153
 154         color = get_percent_color(percent);
 155         return color_snprintf(bf, size, color, fmt, len, percent);
 156 }