mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-07-22 18:40:29 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Fold conv package into fmt

Browse source 
Both packages had nearly identical dependency requirements, so merging
them should help reduce the complexity of the build graph.
This commit is contained in:
Justine Tunney 2020-12-09 15:04:54 -08:00
parent 978b7858f9
commit 1fc91f3580
203 changed files with 352 additions and 563 deletions
Download patch file Download diff file Expand all files Collapse all files

45
libc/fmt/unsleb128.c Normal file
View file

@ -0,0 +1,45 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/fmt/conv.h"
/**
* Decodes a GNU-style varint from a buffer.
*
* The GNU Assembler is able to encode numbers this way, since it's used
* by the DWARF debug format.
*/
int unsleb128(const void *buf, size_t size, int64_t *out) {
int b;
int64_t r, w;
unsigned char c;
const unsigned char *p, *pe;
pe = (p = buf) + size;
r = b = 0;
do {
if (size && p == pe) return -1;
c = *p++;
w = c & 0x7f;
r |= w << b;
b += 7;
} while (c & 0x80);
if (c & 0x40) r |= -1ull << b;
if (out) *out = r;
return p - (const unsigned char *)buf;
}