mirror of
https://github.com/jart/cosmopolitan.git
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b41f91c658
The cosmopolitan command interpreter now has 13 builtin commands, variable support, support for ; / && / || syntax, asynchronous support, and plenty of unit tests with bug fixes. This change fixes a bug in posix_spawn() with null envp arg. strace logging now uses atomic writes for scatter functions. Breaking change renaming GetCpuCount() to _getcpucount(). TurfWar is now updated to use the new token bucket algorithm. WIN32 affinity masks now inherit across fork() and execve().
72 lines
3.2 KiB
C
72 lines
3.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/str/str.h"
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/**
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* Prepares static search buffer.
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*
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* 1. If SRC is too long, it's truncated and *not* NUL-terminated.
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* 2. If SRC is too short, the remainder is zero-filled.
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*
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* Please note this function isn't designed to prevent untrustworthy
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* data from modifying memory without authorization; the memccpy()
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* function can be used for that purpose.
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*
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* Here's an example of the only use case we know of for strncpy:
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*
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* static const struct People {
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* char name[8];
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* int age;
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* } kPeople[] = {
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* {"alice", 29}, //
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* {"bob", 42}, //
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* };
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*
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* int GetAge(const char *name) {
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* char k[8];
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* int m, l, r;
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* l = 0;
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* r = ARRAYLEN(kPeople) - 1;
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* strncpy(k, name, 8);
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* while (l <= r) {
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* m = (l + r) >> 1;
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* if (READ64BE(kPeople[m].name) < READ64BE(k)) {
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* l = m + 1;
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* } else if (READ64BE(kPeople[m].name) > READ64BE(k)) {
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* r = m - 1;
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* } else {
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* return kPeople[m].age;
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* }
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* }
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* return -1;
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* }
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*
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* @return dest
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* @see stpncpy(), memccpy()
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* @asyncsignalsafe
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* @vforksafe
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*/
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char *strncpy(char *dest, const char *src, size_t stride) {
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size_t i;
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for (i = 0; i < stride; ++i) {
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if (!(dest[i] = src[i])) break;
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}
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bzero(dest + i, stride - i);
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return dest;
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}
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