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/*
* Copyright (c) 2016 6WIND S.A.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* Handle color setup for output. */
#include <config.h>
#include "colors.h"
#include <stdlib.h>
#include <string.h>
#include "util.h"
struct color_key {
const char *name;
char **var_ptr;
};
/* Returns a pointer to the variable containing a given color. */
static char **get_color(const struct color_key color_dic[], const char * name);
/* Extract user-defined colors from OVS_COLORS environment variable. */
static void colors_parse_from_env(const struct color_key color_dic[]);
/* Global holder for colors. Declared in header file. */
struct colors colors = { "", "", "", "", "", "", "", "" };
static char **
get_color(const struct color_key color_dic[], const char *name)
{
const struct color_key *color;
for (color = color_dic; color->name; color++) {
if (!strcmp(color->name, name)) {
return color->var_ptr;
}
}
return NULL;
}
void
colors_init(bool enable_color)
{
/* If colored output is not enabled, just keep empty strings for color
* markers, including end marker.
*/
if (!enable_color) {
return;
}
/* Color IDs to use in OVS_COLORS environment variable to overwrite
* defaults with custom colors.
*/
const struct color_key color_dic[] = {
{ "ac", &colors.actions },
{ "dr", &colors.drop },
{ "le", &colors.learn },
{ "pm", &colors.param },
{ "pr", &colors.paren },
{ "sp", &colors.special },
{ "vl", &colors.value },
{ NULL, NULL }
};
/* Actual color to use. First we define default values. */
colors.actions = "\33[1;31m\33[K"; /* bold red */
colors.drop = "\33[34m\33[K"; /* blue */
colors.learn = "\33[31m\33[K"; /* red */
colors.param = "\33[36m\33[K"; /* cyan */
colors.paren = "\33[35m\33[K"; /* magenta */
colors.special = "\33[33m\33[K"; /* yellow */
colors.value = "\33[32m\33[K"; /* green */
colors.end = "\33[m\33[K"; /* end marker */
/* Now, overwrite with user-defined color markers. */
colors_parse_from_env(color_dic);
}
/* Colorized output: get user-defined colors from OVS_COLORS environment
* variable. This must be a string of the form:
* ac=01;31:r=34:le=:pm=02;32:pr=01;30
* (see color_dic[] in colors_init() function for all color names)
* If a color is missing from this string, default value is used instead.
* If a color name is assigned an empty or incorrect value (i.e. something
* containing characters other than decimals and ';'), fields using this color
* will not be highlighted.
* If a color is assigned more than once, the last (rightmost) value appearing
* in the string is kept.
* Unknown color names are ignored so as to ensure forward compatibility.
* (Feeling adventurous? Try combining markers: "ac=1;3;5;7;38;2;30;150;100".)
*/
static void
colors_parse_from_env(const struct color_key color_dic[])
{
const char *color_str = getenv("OVS_COLORS");
if (color_str == NULL || *color_str == '\0') {
return;
}
/* Loop on tokens: they are separated by columns ':' */
char *s = xstrdup(color_str);
char *s_head = s;
for (char *token = strsep(&s, ":");
token != NULL;
token = strsep(&s, ":")) {
char *name = strsep(&token, "=");
for (char *ptr = token; ptr != NULL && *ptr != '\0'; ptr++) {
/* We accept only decimals and ';' for color marker. */
if (*ptr == ';' || (*ptr >= '0' && *ptr <= '9')) {
continue;
}
name = NULL;
break;
}
if (name != NULL) {
/* We found a name and marker contains only decimals and ';'.
* Try to get a pointer to associated color variable. */
char **color_var_ptr = get_color(color_dic, name);
/* If we know that color, update its value. */
if (color_var_ptr != NULL) {
*color_var_ptr = xasprintf("\33[%sm\33[K", token);
}
}
}
free(s_head);
}
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