libc: minimal: add strspn and strcspn support
These functions are useful for determining prefixes, as with file system paths. They are required by littlefs. Signed-off-by: Peter A. Bigot <pab@pabigot.com>
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4 changed files with 61 additions and 0 deletions
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@ -13,6 +13,7 @@ zephyr_library_sources(
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source/string/strncasecmp.c
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source/string/strstr.c
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source/string/string.c
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source/string/strspn.c
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source/stdout/prf.c
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source/stdout/stdout_console.c
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source/stdout/sprintf.c
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@ -31,6 +31,9 @@ extern char *strncat(char *_MLIBC_RESTRICT d, const char *_MLIBC_RESTRICT s,
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size_t n);
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extern char *strstr(const char *s, const char *find);
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extern size_t strspn(const char *s, const char *accept);
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extern size_t strcspn(const char *s, const char *reject);
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extern int memcmp(const void *m1, const void *m2, size_t n);
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extern void *memmove(void *d, const void *s, size_t n);
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extern void *memcpy(void *_MLIBC_RESTRICT d, const void *_MLIBC_RESTRICT s,
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32
lib/libc/minimal/source/string/strspn.c
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32
lib/libc/minimal/source/string/strspn.c
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@ -0,0 +1,32 @@
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/*
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* Copyright (c) 2019 Peter Bigot Consulting, LLC
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <string.h>
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#include <string.h>
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size_t strspn(const char *s,
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const char *accept)
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{
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const char *ins = s;
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while ((*s != '\0') && (strchr(accept, *s) != NULL)) {
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++s;
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}
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return s - ins;
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}
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size_t strcspn(const char *s,
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const char *reject)
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{
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const char *ins = s;
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while ((*s != '\0') && (strchr(reject, *s) == NULL)) {
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++s;
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}
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return s - ins;
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}
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@ -249,6 +249,30 @@ void test_strchr(void)
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}
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/**
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*
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* @brief Test string prefix match functions
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*
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*/
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void test_strxspn(void)
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{
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const char *empty = "";
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const char *cset = "abc";
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zassert_true(strspn("", empty) == 0U, "strspn empty empty");
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zassert_true(strcspn("", empty) == 0U, "strcspn empty empty");
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zassert_true(strspn("abde", cset) == 2U, "strspn match");
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zassert_true(strcspn("abde", cset) == 0U, "strcspn nomatch");
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zassert_true(strspn("da", cset) == 0U, "strspn nomatch");
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zassert_true(strcspn("da", cset) == 1U, "strcspn match");
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zassert_true(strspn("abac", cset) == 4U, "strspn all");
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zassert_true(strcspn("defg", cset) == 4U, "strcspn all");
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}
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/**
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*
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* @brief Test memory comparison function
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@ -310,6 +334,7 @@ void test_main(void)
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ztest_unit_test(test_memset),
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ztest_unit_test(test_strlen),
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ztest_unit_test(test_strcmp),
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ztest_unit_test(test_strxspn),
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ztest_unit_test(test_bsearch)
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);
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ztest_run_test_suite(test_c_lib);
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