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/* SPDX-License-Identifier: GPL-2.0 */
/** \file color.c Functions for printing colored messages. */
/*
* Mostly taken from the git source tree, version 1.6.1.76, January 2009.
*/
#include "para.h"
#include "color.h"
static int parse_color(const char *name, int len)
{
static const char * const color_names[] = {
"normal", "black", "red", "green", "yellow",
"blue", "magenta", "cyan", "white"
};
char *end;
int i;
for (i = 0; i < ARRAY_SIZE(color_names); i++) {
const char *str = color_names[i];
if (!strncasecmp(name, str, len) && !str[len])
return i - 1;
}
i = strtol(name, &end, 10);
if (end - name == len && i >= -1 && i <= 255)
return i;
return -2;
}
static int parse_attr(const char *name, int len)
{
static const int attr_values[] = { 1, 2, 4, 5, 7 };
static const char * const attr_names[] = {
"bold", "dim", "ul", "blink", "reverse"
};
int i;
for (i = 0; i < ARRAY_SIZE(attr_names); i++) {
const char *str = attr_names[i];
if (!strncasecmp(name, str, len) && !str[len])
return attr_values[i];
}
return -1;
}
/**
* Create an escape sequence for colored output.
*
* \param value Human-readable color spec.
* \param dst Result pointer for the escape sequence.
*
* Format of \a value: [fg [bg]] [attr].
*/
void color_parse_or_die(const char *value, char *dst)
{
const char *ptr = value;
int attr = -1;
int fg = -2;
int bg = -2;
if (!strcasecmp(value, "reset")) {
strcpy(dst, COLOR_RESET);
return;
}
/* [fg [bg]] [attr] */
while (*ptr) {
const char *word = ptr;
int val, len = 0;
while (word[len] && !para_isspace(word[len]))
len++;
ptr = word + len;
while (*ptr && para_isspace(*ptr))
ptr++;
val = parse_color(word, len);
if (val >= -1) {
if (fg == -2) {
fg = val;
continue;
}
if (bg == -2) {
bg = val;
continue;
}
goto bad;
}
val = parse_attr(word, len);
if (val < 0 || attr != -1)
goto bad;
attr = val;
}
if (attr >= 0 || fg >= 0 || bg >= 0) {
int sep = 0;
*dst++ = '\033';
*dst++ = '[';
if (attr >= 0) {
*dst++ = '0' + attr;
sep++;
}
if (fg >= 0) {
if (sep++)
*dst++ = ';';
if (fg < 8) {
*dst++ = '3';
*dst++ = '0' + fg;
} else {
dst += sprintf(dst, "38;5;%d", fg);
}
}
if (bg >= 0) {
if (sep)
*dst++ = ';';
if (bg < 8) {
*dst++ = '4';
*dst++ = '0' + bg;
} else {
dst += sprintf(dst, "48;5;%d", bg);
}
}
*dst++ = 'm';
}
*dst = 0;
return;
bad:
PARA_EMERG_LOG("bad color value '%s'\n", value);
exit(EXIT_FAILURE);
}
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