65 lines
2.9 KiB
C
65 lines
2.9 KiB
C
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/*-*- 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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│ This program 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; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ 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 │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/safemacros.h"
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#include "libc/mem/mem.h"
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#include "libc/str/str.h"
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#include "libc/x/x.h"
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/**
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* Concatenates strings / chars to newly allocated memory, e.g.
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*
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* xstrcat("hi", ' ', "there")
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*
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* Or without the C99 helper macro:
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*
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* (xstrcat)("hi", ' ', "there", NULL)
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*
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* This goes twice as fast as the more powerful xasprintf(). It's not
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* quadratic like strcat(). It's much slower than high-effort stpcpy(),
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* particularly with string literals.
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*
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* @see gc()
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*/
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char *(xstrcat)(const char *s, ...) {
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char *p, b[2];
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va_list va;
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size_t i, n, n2, l;
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p = NULL;
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i = n = 0;
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va_start(va, s);
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do {
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if ((intptr_t)s > 0 && (intptr_t)s <= 255) {
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b[0] = (unsigned char)(intptr_t)s;
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b[1] = '\0';
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s = b;
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l = 1;
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} else {
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l = strlen(s);
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}
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if ((n2 = i + l + 16) >= n) {
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p = xrealloc(p, (n = n2 + (n2 >> 1)));
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}
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memcpy(p + i, s, l + 1);
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i += l;
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} while ((s = va_arg(va, const char *)));
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va_end(va);
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return p;
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}
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