tools/perf/util/color.c

   1 #include <linux/kernel.h>
   2 #include "cache.h"
   3 #include "config.h"
   4 #include <stdlib.h>
   5 #include <stdio.h>
   6 #include "color.h"
   7 #include <math.h>
   8 #include <unistd.h>
   9
  10 int perf_use_color_default = -1;
  11
  12 int perf_config_colorbool(const char *var, const char *value, int stdout_is_tty)
  13 {
  14         if (value) {
  15                 if (!strcasecmp(value, "never"))
  16                         return 0;
  17                 if (!strcasecmp(value, "always"))
  18                         return 1;
  19                 if (!strcasecmp(value, "auto"))
  20                         goto auto_color;
  21         }
  22
  23         /* Missing or explicit false to turn off colorization */
  24         if (!perf_config_bool(var, value))
  25                 return 0;
  26
  27         /* any normal truth value defaults to 'auto' */
  28  auto_color:
  29         if (stdout_is_tty < 0)
  30                 stdout_is_tty = isatty(1);
  31         if (stdout_is_tty || pager_in_use()) {
  32                 char *term = getenv("TERM");
  33                 if (term && strcmp(term, "dumb"))
  34                         return 1;
  35         }
  36         return 0;
  37 }
  38
  39 int perf_color_default_config(const char *var, const char *value,
  40                               void *cb __maybe_unused)
  41 {
  42         if (!strcmp(var, "color.ui")) {
  43                 perf_use_color_default = perf_config_colorbool(var, value, -1);
  44                 return 0;
  45         }
  46
  47         return 0;
  48 }
  49
  50 static int __color_vsnprintf(char *bf, size_t size, const char *color,
  51                              const char *fmt, va_list args, const char *trail)
  52 {
  53         int r = 0;
  54
  55         /*
  56          * Auto-detect:
  57          */
  58         if (perf_use_color_default < 0) {
  59                 if (isatty(1) || pager_in_use())
  60                         perf_use_color_default = 1;
  61                 else
  62                         perf_use_color_default = 0;
  63         }
  64
  65         if (perf_use_color_default && *color)
  66                 r += scnprintf(bf, size, "%s", color);
  67         r += vscnprintf(bf + r, size - r, fmt, args);
  68         if (perf_use_color_default && *color)
  69                 r += scnprintf(bf + r, size - r, "%s", PERF_COLOR_RESET);
  70         if (trail)
  71                 r += scnprintf(bf + r, size - r, "%s", trail);
  72         return r;
  73 }
  74
  75 /* Colors are not included in return value */
  76 static int __color_vfprintf(FILE *fp, const char *color, const char *fmt,
  77                 va_list args)
  78 {
  79         int r = 0;
  80
  81         /*
  82          * Auto-detect:
  83          */
  84         if (perf_use_color_default < 0) {
  85                 if (isatty(fileno(fp)) || pager_in_use())
  86                         perf_use_color_default = 1;
  87                 else
  88                         perf_use_color_default = 0;
  89         }
  90
  91         if (perf_use_color_default && *color)
  92                 fprintf(fp, "%s", color);
  93         r += vfprintf(fp, fmt, args);
  94         if (perf_use_color_default && *color)
  95                 fprintf(fp, "%s", PERF_COLOR_RESET);
  96         return r;
  97 }
  98
  99 int color_vsnprintf(char *bf, size_t size, const char *color,
 100                     const char *fmt, va_list args)
 101 {
 102         return __color_vsnprintf(bf, size, color, fmt, args, NULL);
 103 }
 104
 105 int color_vfprintf(FILE *fp, const char *color, const char *fmt, va_list args)
 106 {
 107         return __color_vfprintf(fp, color, fmt, args);
 108 }
 109
 110 int color_snprintf(char *bf, size_t size, const char *color,
 111                    const char *fmt, ...)
 112 {
 113         va_list args;
 114         int r;
 115
 116         va_start(args, fmt);
 117         r = color_vsnprintf(bf, size, color, fmt, args);
 118         va_end(args);
 119         return r;
 120 }
 121
 122 int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
 123 {
 124         va_list args;
 125         int r;
 126
 127         va_start(args, fmt);
 128         r = color_vfprintf(fp, color, fmt, args);
 129         va_end(args);
 130         return r;
 131 }
 132
 133 /*
 134  * This function splits the buffer by newlines and colors the lines individually.
 135  *
 136  * Returns 0 on success.
 137  */
 138 int color_fwrite_lines(FILE *fp, const char *color,
 139                 size_t count, const char *buf)
 140 {
 141         if (!*color)
 142                 return fwrite(buf, count, 1, fp) != 1;
 143
 144         while (count) {
 145                 char *p = memchr(buf, '\n', count);
 146
 147                 if (p != buf && (fputs(color, fp) < 0 ||
 148                                 fwrite(buf, p ? (size_t)(p - buf) : count, 1, fp) != 1 ||
 149                                 fputs(PERF_COLOR_RESET, fp) < 0))
 150                         return -1;
 151                 if (!p)
 152                         return 0;
 153                 if (fputc('\n', fp) < 0)
 154                         return -1;
 155                 count -= p + 1 - buf;
 156                 buf = p + 1;
 157         }
 158         return 0;
 159 }
 160
 161 const char *get_percent_color(double percent)
 162 {
 163         const char *color = PERF_COLOR_NORMAL;
 164
 165         /*
 166          * We color high-overhead entries in red, mid-overhead
 167          * entries in green - and keep the low overhead places
 168          * normal:
 169          */
 170         if (fabs(percent) >= MIN_RED)
 171                 color = PERF_COLOR_RED;
 172         else {
 173                 if (fabs(percent) > MIN_GREEN)
 174                         color = PERF_COLOR_GREEN;
 175         }
 176         return color;
 177 }
 178
 179 int percent_color_fprintf(FILE *fp, const char *fmt, double percent)
 180 {
 181         int r;
 182         const char *color;
 183
 184         color = get_percent_color(percent);
 185         r = color_fprintf(fp, color, fmt, percent);
 186
 187         return r;
 188 }
 189
 190 int value_color_snprintf(char *bf, size_t size, const char *fmt, double value)
 191 {
 192         const char *color = get_percent_color(value);
 193         return color_snprintf(bf, size, color, fmt, value);
 194 }
 195
 196 int percent_color_snprintf(char *bf, size_t size, const char *fmt, ...)
 197 {
 198         va_list args;
 199         double percent;
 200
 201         va_start(args, fmt);
 202         percent = va_arg(args, double);
 203         va_end(args);
 204         return value_color_snprintf(bf, size, fmt, percent);
 205 }
 206
 207 int percent_color_len_snprintf(char *bf, size_t size, const char *fmt, ...)
 208 {
 209         va_list args;
 210         int len;
 211         double percent;
 212         const char *color;
 213
 214         va_start(args, fmt);
 215         len = va_arg(args, int);
 216         percent = va_arg(args, double);
 217         va_end(args);
 218
 219         color = get_percent_color(percent);
 220         return color_snprintf(bf, size, color, fmt, len, percent);
 221 }