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/* See LICENSE file for copyright and license details. */
#include "common.h"
#define LIST_FIELDS_EXCEPT_FINAL(X)\
X(foundry)\
X(family_name)\
X(weight_name)\
X(slant)\
X(setwidth_name)\
X(add_style_name)\
X(pixel_size)\
X(point_size)\
X(resolution_x)\
X(resolution_y)\
X(spacing)\
X(average_width)\
X(charset_registry)
struct range {
uint32_t first;
uint32_t last;
};
static int
parse_hexadecimal(const char *s, const char **endp, uint32_t *valuep)
{
uint64_t r = 0;
if (!isxdigit(*s))
return -1;
for (;; s++) {
if (isdigit(*s))
r = (r * 16) | (*s & 15);
else if (isxdigit(*s))
r = (r * 16) | ((*s & 15) + 9);
else
break;
if (r > INT32_MAX)
return -1;
}
*endp = s;
*valuep = (uint32_t)r;
return 0;
}
static int
parse_decimal(const char *s, const char **endp, uint32_t *valuep)
{
uint64_t r = 0;
if (!isdigit(*s))
return -1;
for (; isdigit(*s); s++) {
r = r * 10 + (*s & 15);
if (r > INT32_MAX)
return -1;
}
*endp = s;
*valuep = (uint32_t)r;
return 0;
}
static int
parse_number(const char *s, const char **endp, uint32_t *valuep)
{
if (s[0] == '0' && s[1] == 'x')
return parse_hexadecimal(&s[2], endp, valuep);
else
return parse_decimal(&s[0], endp, valuep);
}
static int
cmprange(const void *av, const void *bv)
{
const struct range *a = av, *b = bv;
return a->first < b->first ? -1 : a->first > b->first;
}
static int
fix_charset_subset(char *out, const char *in)
{
struct range ranges[128], saved;
size_t i, n = 0;
const char *s;
uint32_t t;
for (s = in; *s; s++) {
if (*s == ' ')
continue;
if (parse_number(s, &s, &ranges[0].first))
return -1;
if (*s == '_') {
if (parse_number(&s[1], &s, &ranges[0].last))
return -1;
if (ranges[0].first > ranges[0].last) {
t = ranges[0].first;
ranges[0].first = ranges[0].last;
ranges[0].last = t;
}
} else {
ranges[0].last = ranges[0].first;
}
if (*s && *s != ' ')
return -1;
}
if (!n) {
*out = '\0';
return 0;
}
qsort(ranges, n, sizeof(*ranges), cmprange);
saved = ranges[0];
for (i = 1; i < n; i++) {
if (ranges[i].first <= saved.last) {
if (ranges[i].last > saved.last)
saved.last = ranges[i].last;
} else {
if (saved.first == saved.last)
out += sprintf(out, "%"PRId32" ", saved.first);
else
out += sprintf(out, "%"PRId32"-%"PRId32" ", saved.first, saved.last);
saved = ranges[i];
}
}
if (saved.first == saved.last)
out += sprintf(out, "%"PRId32" ", saved.first);
else
out += sprintf(out, "%"PRId32"-%"PRId32" ", saved.first, saved.last);
out[-1] = '\0';
return 0;
}
int
libfonts_decode_font_description(struct libfonts_font_description *desc, const char *in)
{
char subset[256];
const char *s = in;
char *buf, *ss = subset;
int have_subset = 0;
int in_subset = 0;
if (strlen(in) > 255) {
errno = EINVAL;
return -1;
}
memset(desc, 0, sizeof(*desc));
buf = desc->_buf;
if (*s == '+') {
desc->xlfd_version = buf;
for (s++; *s && *s != '-'; s++)
*buf++ = *s == '~' ? '-' : *s;
*buf++ = '\0';
}
#define X(F)\
if (*s != '-')\
goto private;\
desc->F = buf;\
for (s++; *s && *s != '-'; s++)\
*buf++ = *s == '~' ? '-' : *s;\
*buf++ = '\0';
LIST_FIELDS_EXCEPT_FINAL(X)
#undef X
if (*s != '-')
goto private;
desc->charset_encoding = buf;
for (s++; *s && *s != '-'; s++) {
if (in_subset) {
if (*s == ']')
in_subset = 0;
else
*ss++ = *s == '~' ? '-' : *s;
} else {
if (*s == '[') {
in_subset = 1;
if (have_subset)
*ss++ = ' ';
else
have_subset = 1;
} else {
*buf++ = *s == '~' ? '-' : *s;
}
}
}
*buf++ = '\0';
if (in_subset)
goto private;
if (have_subset) {
*ss = '\0';
desc->charset_subset = buf;
if (fix_charset_subset(buf, subset))
goto private;
}
if (*s == '-') {
desc->unrecognised_fields = buf;
stpcpy(buf, &s[1]);
}
return 0;
private:
memset(desc, 0, sizeof(*desc));
stpcpy(desc->_buf, in);
desc->private_font_name = desc->_buf;
return 0;
}
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