113 lines
3.7 KiB
C
113 lines
3.7 KiB
C
// VERSION: 1.1.2
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/* Utilities to make working with plain old C strings easier.
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*
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*
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* Copyright (c) 2021 nytpu <alex [at] nytpu.com>
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* SPDX-License-Identifier: BSL-1.0
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* The orginal source for this file is available at <https://git.sr.ht/~nytpu/libmisc>.
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*
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* Permission is hereby granted, free of charge, to any person or organization
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* obtaining a copy of the software and accompanying documentation covered by
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* this license (the "Software") to use, reproduce, display, distribute,
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* execute, and transmit the Software, and to prepare derivative works of the
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* Software, and to permit third-parties to whom the Software is furnished to
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* do so, all subject to the following:
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*
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* The copyright notices in the Software and this entire statement, including
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* the above license grant, this restriction and the following disclaimer, must
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* be included in all copies of the Software, in whole or in part, and all
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* derivative works of the Software, unless such copies or derivative works are
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* solely in the form of machine-executable object code generated by a source
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* language processor.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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* SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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* FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include "string_util.h"
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#include <stdarg.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <string.h>
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// rip-off from <https://text.causal.agency/024-seprintf.txt>, which is itself
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// a rip-off of seprint from plan 9's libc.
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char *
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seprintf(char *ptr, char *end, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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int n = vsnprintf(ptr, end - ptr, fmt, ap);
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va_end(ap);
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if (n < 0) return NULL;
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if (n > end - ptr) return end;
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return ptr + n;
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}
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bool
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string_starts_with(const char *str, const char *prefix)
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{
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return !(strncmp(str, prefix, strlen(prefix)));
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}
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bool
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string_ends_with(const char *str, const char *suffix)
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{
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int str_len = strlen(str);
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int suffix_len = strlen(suffix);
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return (str_len >= suffix_len)
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&& (strcmp(str + (str_len - suffix_len), suffix) == 0);
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}
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#ifdef TEST
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#include "testing.h"
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#include <stdlib.h>
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int
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main(void)
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{
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begin_tests("string_util.c");
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begin_group("seprintf");
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char buf[21];
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char *ptr = buf, *end = &buf[sizeof(buf)];
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for (size_t i = 0; i < sizeof(buf); ++i) {
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ptr = seprintf(ptr, end, "%1d", i % 10);
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assert(ptr == &buf[i + 1]);
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}
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assert(ptr == end);
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ptr = seprintf(ptr, end, "hello, world!");
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assert(ptr == end);
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end_group();
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begin_group("string_starts_with");
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assert(string_starts_with("ello, world!", "h") == false);
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assert(string_starts_with("hello, world!", "hello, world") == true);
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assert(string_starts_with("¡hello, world!", "hello") == false);
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assert(string_starts_with("hello, world!", "h") == true);
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assert(string_starts_with("hello, world!", "ello") == false);
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assert(string_starts_with("hello, world!", "world!") == false);
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assert(string_starts_with("/CN=test", "/CN=") == true);
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end_group();
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begin_group("string_ends_with");
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assert(string_ends_with("h", "ello, world!") == false);
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assert(string_ends_with("hello, world!", "ello, world!") == true);
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assert(string_ends_with("hello, world! 2!", "ello, world!") == false);
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assert(string_ends_with("hello, world!", "!") == true);
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assert(string_ends_with("hello, world!", "hello") == false);
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assert(string_ends_with("hello, world!", "world") == false);
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end_group();
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end_tests();
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return 0;
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}
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#endif // TEST
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