tools/perf/util/color.c

   1 #include <linux/kernel.h>
   2 #include "cache.h"
   3 #include "color.h"
   4 #include <math.h>
   5
   6 int perf_use_color_default = -1;
   7
   8 int perf_config_colorbool(const char *var, const char *value, int stdout_is_tty)
   9 {
  10         if (value) {
  11                 if (!strcasecmp(value, "never"))
  12                         return 0;
  13                 if (!strcasecmp(value, "always"))
  14                         return 1;
  15                 if (!strcasecmp(value, "auto"))
  16                         goto auto_color;
  17         }
  18
  19         /* Missing or explicit false to turn off colorization */
  20         if (!perf_config_bool(var, value))
  21                 return 0;
  22
  23         /* any normal truth value defaults to 'auto' */
  24  auto_color:
  25         if (stdout_is_tty < 0)
  26                 stdout_is_tty = isatty(1);
  27         if (stdout_is_tty || (pager_in_use() && pager_use_color)) {
  28                 char *term = getenv("TERM");
  29                 if (term && strcmp(term, "dumb"))
  30                         return 1;
  31         }
  32         return 0;
  33 }
  34
  35 int perf_color_default_config(const char *var, const char *value, void *cb)
  36 {
  37         if (!strcmp(var, "color.ui")) {
  38                 perf_use_color_default = perf_config_colorbool(var, value, -1);
  39                 return 0;
  40         }
  41
  42         return perf_default_config(var, value, cb);
  43 }
  44
  45 static int __color_vsnprintf(char *bf, size_t size, const char *color,
  46                              const char *fmt, va_list args, const char *trail)
  47 {
  48         int r = 0;
  49
  50         /*
  51          * Auto-detect:
  52          */
  53         if (perf_use_color_default < 0) {
  54                 if (isatty(1) || pager_in_use())
  55                         perf_use_color_default = 1;
  56                 else
  57                         perf_use_color_default = 0;
  58         }
  59
  60         if (perf_use_color_default && *color)
  61                 r += scnprintf(bf, size, "%s", color);
  62         r += vscnprintf(bf + r, size - r, fmt, args);
  63         if (perf_use_color_default && *color)
  64                 r += scnprintf(bf + r, size - r, "%s", PERF_COLOR_RESET);
  65         if (trail)
  66                 r += scnprintf(bf + r, size - r, "%s", trail);
  67         return r;
  68 }
  69
  70 static int __color_vfprintf(FILE *fp, const char *color, const char *fmt,
  71                 va_list args, const char *trail)
  72 {
  73         int r = 0;
  74
  75         /*
  76          * Auto-detect:
  77          */
  78         if (perf_use_color_default < 0) {
  79                 if (isatty(fileno(fp)) || pager_in_use())
  80                         perf_use_color_default = 1;
  81                 else
  82                         perf_use_color_default = 0;
  83         }
  84
  85         if (perf_use_color_default && *color)
  86                 r += fprintf(fp, "%s", color);
  87         r += vfprintf(fp, fmt, args);
  88         if (perf_use_color_default && *color)
  89                 r += fprintf(fp, "%s", PERF_COLOR_RESET);
  90         if (trail)
  91                 r += fprintf(fp, "%s", trail);
  92         return r;
  93 }
  94
  95 int color_vsnprintf(char *bf, size_t size, const char *color,
  96                     const char *fmt, va_list args)
  97 {
  98         return __color_vsnprintf(bf, size, color, fmt, args, NULL);
  99 }
 100
 101 int color_vfprintf(FILE *fp, const char *color, const char *fmt, va_list args)
 102 {
 103         return __color_vfprintf(fp, color, fmt, args, NULL);
 104 }
 105
 106 int color_snprintf(char *bf, size_t size, const char *color,
 107                    const char *fmt, ...)
 108 {
 109         va_list args;
 110         int r;
 111
 112         va_start(args, fmt);
 113         r = color_vsnprintf(bf, size, color, fmt, args);
 114         va_end(args);
 115         return r;
 116 }
 117
 118 int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
 119 {
 120         va_list args;
 121         int r;
 122
 123         va_start(args, fmt);
 124         r = color_vfprintf(fp, color, fmt, args);
 125         va_end(args);
 126         return r;
 127 }
 128
 129 int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
 130 {
 131         va_list args;
 132         int r;
 133         va_start(args, fmt);
 134         r = __color_vfprintf(fp, color, fmt, args, "\n");
 135         va_end(args);
 136         return r;
 137 }
 138
 139 /*
 140  * This function splits the buffer by newlines and colors the lines individually.
 141  *
 142  * Returns 0 on success.
 143  */
 144 int color_fwrite_lines(FILE *fp, const char *color,
 145                 size_t count, const char *buf)
 146 {
 147         if (!*color)
 148                 return fwrite(buf, count, 1, fp) != 1;
 149
 150         while (count) {
 151                 char *p = memchr(buf, '\n', count);
 152
 153                 if (p != buf && (fputs(color, fp) < 0 ||
 154                                 fwrite(buf, p ? (size_t)(p - buf) : count, 1, fp) != 1 ||
 155                                 fputs(PERF_COLOR_RESET, fp) < 0))
 156                         return -1;
 157                 if (!p)
 158                         return 0;
 159                 if (fputc('\n', fp) < 0)
 160                         return -1;
 161                 count -= p + 1 - buf;
 162                 buf = p + 1;
 163         }
 164         return 0;
 165 }
 166
 167 const char *get_percent_color(double percent)
 168 {
 169         const char *color = PERF_COLOR_NORMAL;
 170
 171         /*
 172          * We color high-overhead entries in red, mid-overhead
 173          * entries in green - and keep the low overhead places
 174          * normal:
 175          */
 176         if (fabs(percent) >= MIN_RED)
 177                 color = PERF_COLOR_RED;
 178         else {
 179                 if (fabs(percent) > MIN_GREEN)
 180                         color = PERF_COLOR_GREEN;
 181         }
 182         return color;
 183 }
 184
 185 int percent_color_fprintf(FILE *fp, const char *fmt, double percent)
 186 {
 187         int r;
 188         const char *color;
 189
 190         color = get_percent_color(percent);
 191         r = color_fprintf(fp, color, fmt, percent);
 192
 193         return r;
 194 }
 195
 196 int value_color_snprintf(char *bf, size_t size, const char *fmt, double value)
 197 {
 198         const char *color = get_percent_color(value);
 199         return color_snprintf(bf, size, color, fmt, value);
 200 }
 201
 202 int percent_color_snprintf(char *bf, size_t size, const char *fmt, ...)
 203 {
 204         va_list args;
 205         double percent;
 206
 207         va_start(args, fmt);
 208         percent = va_arg(args, double);
 209         va_end(args);
 210         return value_color_snprintf(bf, size, fmt, percent);
 211 }
 212
 213 int percent_color_len_snprintf(char *bf, size_t size, const char *fmt, ...)
 214 {
 215         va_list args;
 216         int len;
 217         double percent;
 218         const char *color;
 219
 220         va_start(args, fmt);
 221         len = va_arg(args, int);
 222         percent = va_arg(args, double);
 223         va_end(args);
 224
 225         color = get_percent_color(percent);
 226         return color_snprintf(bf, size, color, fmt, len, percent);
 227 }