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/*
* No copyright is claimed. This code is in the public domain; do with
* it what you wish.
*
* Copyright (C) 2012-2015 Karel Zak <kzak@redhat.com>
*/
#include "c.h"
#include "color-names.h"
#include <ctype.h>
struct ul_color_name {
const char *name;
const char *seq;
};
/*
* qsort/bsearch buddy
*/
static int cmp_color_name(const void *a0, const void *b0)
{
const struct ul_color_name
*a = (const struct ul_color_name *) a0,
*b = (const struct ul_color_name *) b0;
return strcmp(a->name, b->name);
}
/*
* Maintains human readable color names
*/
const char *color_sequence_from_colorname(const char *str)
{
static const struct ul_color_name basic_schemes[] = {
{ "black", UL_COLOR_BLACK },
{ "blink", UL_COLOR_BLINK },
{ "blue", UL_COLOR_BLUE },
{ "bold", UL_COLOR_BOLD },
{ "brown", UL_COLOR_BROWN },
{ "cyan", UL_COLOR_CYAN },
{ "darkgray", UL_COLOR_DARK_GRAY },
{ "gray", UL_COLOR_GRAY },
{ "green", UL_COLOR_GREEN },
{ "halfbright", UL_COLOR_HALFBRIGHT },
{ "lightblue", UL_COLOR_BOLD_BLUE },
{ "lightcyan", UL_COLOR_BOLD_CYAN },
{ "lightgray,", UL_COLOR_GRAY },
{ "lightgreen", UL_COLOR_BOLD_GREEN },
{ "lightmagenta", UL_COLOR_BOLD_MAGENTA },
{ "lightred", UL_COLOR_BOLD_RED },
{ "magenta", UL_COLOR_MAGENTA },
{ "red", UL_COLOR_RED },
{ "reset", UL_COLOR_RESET, },
{ "reverse", UL_COLOR_REVERSE },
{ "yellow", UL_COLOR_BOLD_YELLOW },
{ "white", UL_COLOR_WHITE }
};
struct ul_color_name key = { .name = str }, *res;
if (!str)
return NULL;
res = bsearch(&key, basic_schemes, ARRAY_SIZE(basic_schemes),
sizeof(struct ul_color_name),
cmp_color_name);
return res ? res->seq : NULL;
}
int color_is_sequence(const char *color)
{
if (color && *color == 0x1B) {
size_t len = strlen(color);
if (len >= 4 &&
*(color + 1) == '[' &&
isdigit(*(color + 2)) &&
*(color + len - 1) == 'm')
return 1;
}
return 0;
}
/* canonicalize sequence */
static int __color_canonicalize(const char *str, char **seq)
{
char *in, *out;
int len;
if (!str)
return -EINVAL;
*seq = NULL;
/* convert color names like "red" to the real sequence */
if (*str != '\\' && isalpha(*str)) {
const char *s = color_sequence_from_colorname(str);
*seq = strdup(s ? s : str);
return *seq ? 0 : -ENOMEM;
}
/* convert xx;yy sequences to "\033[xx;yy" */
if ((len = asprintf(seq, "\033[%sm", str)) < 1)
return -ENOMEM;
for (in = *seq, out = *seq; in && *in; in++) {
if (*in != '\\') {
*out++ = *in;
continue;
}
switch(*(in + 1)) {
case 'a':
*out++ = '\a'; /* Bell */
break;
case 'b':
*out++ = '\b'; /* Backspace */
break;
case 'e':
*out++ = '\033'; /* Escape */
break;
case 'f':
*out++ = '\f'; /* Form Feed */
break;
case 'n':
*out++ = '\n'; /* Newline */
break;
case 'r':
*out++ = '\r'; /* Carriage Return */
break;
case 't':
*out++ = '\t'; /* Tab */
break;
case 'v':
*out++ = '\v'; /* Vertical Tab */
break;
case '\\':
*out++ = '\\'; /* Backslash */
break;
case '_':
*out++ = ' '; /* Space */
break;
case '#':
*out++ = '#'; /* Hash mark */
break;
case '?':
*out++ = '?'; /* Question mark */
break;
default:
*out++ = *in;
*out++ = *(in + 1);
break;
}
in++;
}
if (out) {
assert ((out - *seq) <= len);
*out = '\0';
}
return 0;
}
char *color_get_sequence(const char *color)
{
char *seq = NULL;
int rc = __color_canonicalize(color, &seq);
return rc ? NULL : seq;
}
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