mirror of https://github.com/mpv-player/mpv
293 lines
6.9 KiB
C
293 lines
6.9 KiB
C
/*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <string.h>
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#include <assert.h>
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#include <ctype.h>
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#include <stdarg.h>
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#include <libavutil/common.h>
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#include "talloc.h"
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#include "core/bstr.h"
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int bstrcmp(struct bstr str1, struct bstr str2)
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{
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int ret = memcmp(str1.start, str2.start, FFMIN(str1.len, str2.len));
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if (!ret) {
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if (str1.len == str2.len)
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return 0;
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else if (str1.len > str2.len)
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return 1;
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else
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return -1;
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}
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return ret;
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}
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int bstrcasecmp(struct bstr str1, struct bstr str2)
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{
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int ret = strncasecmp(str1.start, str2.start, FFMIN(str1.len, str2.len));
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if (!ret) {
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if (str1.len == str2.len)
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return 0;
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else if (str1.len > str2.len)
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return 1;
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else
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return -1;
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}
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return ret;
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}
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int bstrchr(struct bstr str, int c)
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{
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for (int i = 0; i < str.len; i++)
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if (str.start[i] == c)
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return i;
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return -1;
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}
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int bstrrchr(struct bstr str, int c)
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{
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for (int i = str.len - 1; i >= 0; i--)
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if (str.start[i] == c)
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return i;
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return -1;
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}
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int bstrcspn(struct bstr str, const char *reject)
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{
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int i;
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for (i = 0; i < str.len; i++)
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if (strchr(reject, str.start[i]))
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break;
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return i;
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}
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int bstr_find(struct bstr haystack, struct bstr needle)
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{
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for (int i = 0; i < haystack.len; i++)
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if (bstr_startswith(bstr_splice(haystack, i, haystack.len), needle))
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return i;
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return -1;
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}
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struct bstr bstr_lstrip(struct bstr str)
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{
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while (str.len && isspace(*str.start)) {
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str.start++;
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str.len--;
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}
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return str;
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}
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struct bstr bstr_strip(struct bstr str)
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{
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str = bstr_lstrip(str);
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while (str.len && isspace(str.start[str.len - 1]))
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str.len--;
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return str;
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}
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struct bstr bstr_split(struct bstr str, const char *sep, struct bstr *rest)
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{
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int start;
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for (start = 0; start < str.len; start++)
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if (!strchr(sep, str.start[start]))
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break;
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str = bstr_cut(str, start);
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int end = bstrcspn(str, sep);
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if (rest) {
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*rest = bstr_cut(str, end);
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}
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return bstr_splice(str, 0, end);
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}
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struct bstr bstr_splice(struct bstr str, int start, int end)
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{
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if (start < 0)
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start += str.len;
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if (end < 0)
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end += str.len;
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end = FFMIN(end, str.len);
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start = FFMAX(start, 0);
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end = FFMAX(end, start);
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str.start += start;
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str.len = end - start;
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return str;
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}
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long long bstrtoll(struct bstr str, struct bstr *rest, int base)
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{
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str = bstr_lstrip(str);
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char buf[51];
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int len = FFMIN(str.len, 50);
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memcpy(buf, str.start, len);
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buf[len] = 0;
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char *endptr;
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long long r = strtoll(buf, &endptr, base);
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if (rest)
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*rest = bstr_cut(str, endptr - buf);
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return r;
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}
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double bstrtod(struct bstr str, struct bstr *rest)
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{
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str = bstr_lstrip(str);
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char buf[101];
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int len = FFMIN(str.len, 100);
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memcpy(buf, str.start, len);
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buf[len] = 0;
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char *endptr;
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double r = strtod(buf, &endptr);
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if (rest)
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*rest = bstr_cut(str, endptr - buf);
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return r;
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}
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struct bstr *bstr_splitlines(void *talloc_ctx, struct bstr str)
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{
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if (str.len == 0)
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return NULL;
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int count = 0;
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for (int i = 0; i < str.len; i++)
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if (str.start[i] == '\n')
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count++;
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if (str.start[str.len - 1] != '\n')
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count++;
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struct bstr *r = talloc_array_ptrtype(talloc_ctx, r, count);
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unsigned char *p = str.start;
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for (int i = 0; i < count - 1; i++) {
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r[i].start = p;
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while (*p++ != '\n');
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r[i].len = p - r[i].start;
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}
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r[count - 1].start = p;
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r[count - 1].len = str.start + str.len - p;
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return r;
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}
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struct bstr bstr_getline(struct bstr str, struct bstr *rest)
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{
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int pos = bstrchr(str, '\n');
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if (pos < 0)
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pos = str.len;
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if (rest)
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*rest = bstr_cut(str, pos + 1);
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return bstr_splice(str, 0, pos + 1);
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}
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struct bstr bstr_strip_linebreaks(struct bstr str)
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{
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if (bstr_endswith0(str, "\r\n")) {
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str = bstr_splice(str, 0, str.len - 2);
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} else if (bstr_endswith0(str, "\n")) {
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str = bstr_splice(str, 0, str.len - 1);
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}
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return str;
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}
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bool bstr_eatstart(struct bstr *s, struct bstr prefix)
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{
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if (!bstr_startswith(*s, prefix))
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return false;
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*s = bstr_cut(*s, prefix.len);
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return true;
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}
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void bstr_lower(struct bstr str)
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{
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for (int i = 0; i < str.len; i++)
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str.start[i] = tolower(str.start[i]);
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}
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int bstr_sscanf(struct bstr str, const char *format, ...)
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{
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char *ptr = bstrdup0(NULL, str);
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va_list va;
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va_start(va, format);
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int ret = vsscanf(ptr, format, va);
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va_end(va);
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talloc_free(ptr);
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return ret;
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}
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int bstr_parse_utf8_code_length(unsigned char b)
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{
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if (b < 128)
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return 1;
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int bytes = 7 - av_log2(b ^ 255);
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return (bytes >= 2 && bytes <= 4) ? bytes : -1;
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}
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int bstr_decode_utf8(struct bstr s, struct bstr *out_next)
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{
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if (s.len == 0)
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return -1;
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unsigned int codepoint = s.start[0];
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s.start++; s.len--;
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if (codepoint >= 128) {
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int bytes = bstr_parse_utf8_code_length(codepoint);
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if (bytes < 0 || s.len < bytes - 1)
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return -1;
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codepoint &= 127 >> bytes;
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for (int n = 1; n < bytes; n++) {
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int tmp = s.start[0];
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if ((tmp & 0xC0) != 0x80)
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return -1;
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codepoint = (codepoint << 6) | (tmp & ~0xC0);
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s.start++; s.len--;
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}
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}
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if (out_next)
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*out_next = s;
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return codepoint;
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}
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bool bstr_case_startswith(struct bstr s, struct bstr prefix)
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{
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struct bstr start = bstr_splice(s, 0, prefix.len);
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return start.len == prefix.len && bstrcasecmp(start, prefix) == 0;
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}
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bool bstr_case_endswith(struct bstr s, struct bstr suffix)
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{
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struct bstr end = bstr_cut(s, -suffix.len);
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return end.len == suffix.len && bstrcasecmp(end, suffix) == 0;
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}
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struct bstr bstr_strip_ext(struct bstr str)
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{
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int dotpos = bstrrchr(str, '.');
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if (dotpos < 0)
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return str;
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return (struct bstr){str.start, dotpos};
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}
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struct bstr bstr_get_ext(struct bstr s)
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{
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int dotpos = bstrrchr(s, '.');
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if (dotpos < 0)
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return (struct bstr){NULL, 0};
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return bstr_splice(s, dotpos + 1, s.len);
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}
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