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 /*
  97  * This function splits the buffer by newlines and colors the lines individually.
  98  *
  99  * Returns 0 on success.
 100  */
 101 int color_fwrite_lines(FILE *fp, const char *color,
 102                 size_t count, const char *buf)
 103 {
 104         if (!*color)
 105                 return fwrite(buf, count, 1, fp) != 1;
 106
 107         while (count) {
 108                 char *p = memchr(buf, '\n', count);
 109
 110                 if (p != buf && (fputs(color, fp) < 0 ||
 111                                 fwrite(buf, p ? (size_t)(p - buf) : count, 1, fp) != 1 ||
 112                                 fputs(PERF_COLOR_RESET, fp) < 0))
 113                         return -1;
 114                 if (!p)
 115                         return 0;
 116                 if (fputc('\n', fp) < 0)
 117                         return -1;
 118                 count -= p + 1 - buf;
 119                 buf = p + 1;
 120         }
 121         return 0;
 122 }
 123
 124 const char *get_percent_color(double percent)
 125 {
 126         const char *color = PERF_COLOR_NORMAL;
 127
 128         /*
 129          * We color high-overhead entries in red, mid-overhead
 130          * entries in green - and keep the low overhead places
 131          * normal:
 132          */
 133         if (fabs(percent) >= MIN_RED)
 134                 color = PERF_COLOR_RED;
 135         else {
 136                 if (fabs(percent) > MIN_GREEN)
 137                         color = PERF_COLOR_GREEN;
 138         }
 139         return color;
 140 }
 141
 142 int percent_color_fprintf(FILE *fp, const char *fmt, double percent)
 143 {
 144         int r;
 145         const char *color;
 146
 147         color = get_percent_color(percent);
 148         r = color_fprintf(fp, color, fmt, percent);
 149
 150         return r;
 151 }
 152
 153 int value_color_snprintf(char *bf, size_t size, const char *fmt, double value)
 154 {
 155         const char *color = get_percent_color(value);
 156         return color_snprintf(bf, size, color, fmt, value);
 157 }
 158
 159 int percent_color_snprintf(char *bf, size_t size, const char *fmt, ...)
 160 {
 161         va_list args;
 162         double percent;
 163
 164         va_start(args, fmt);
 165         percent = va_arg(args, double);
 166         va_end(args);
 167         return value_color_snprintf(bf, size, fmt, percent);
 168 }
 169
 170 int percent_color_len_snprintf(char *bf, size_t size, const char *fmt, ...)
 171 {
 172         va_list args;
 173         int len;
 174         double percent;
 175         const char *color;
 176
 177         va_start(args, fmt);
 178         len = va_arg(args, int);
 179         percent = va_arg(args, double);
 180         va_end(args);
 181
 182         color = get_percent_color(percent);
 183         return color_snprintf(bf, size, color, fmt, len, percent);
 184 }