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authorMattias Andrée <maandree@operamail.com>2015-09-01 06:41:47 +0200
committerMattias Andrée <maandree@operamail.com>2015-09-01 06:41:47 +0200
commitb3c244eb6488d254183d7e41c5084a3cbf573548 (patch)
tree4e1e0e648c7f1885f2af99993207f54409aceecd
parentadd strstr functions (diff)
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add strspn functions
Signed-off-by: Mattias Andrée <maandree@operamail.com>
-rw-r--r--include/string.h40
-rw-r--r--include/wchar.h40
-rw-r--r--src/string/strspn.c96
-rw-r--r--src/wchar/wcsspn.c81
4 files changed, 257 insertions, 0 deletions
diff --git a/include/string.h b/include/string.h
index 8034973..676a721 100644
--- a/include/string.h
+++ b/include/string.h
@@ -973,6 +973,46 @@ void* memmem(const void*, size_t, const void*, size_t)
/* TODO Add case right-to-left substring searching functions. */
+/**
+ * Returns length of the initial substring
+ * that consists entirely of a set of specified
+ * bytes.
+ *
+ * @param string The string.
+ * @param skipset Bytes allowed in the substring.
+ * @return The length of the substring.
+ */
+size_t strspn(const char*, const char*)
+ __GCC_ONLY(__attribute__((warn_unused_result, nonnull)));
+
+/**
+ * Returns length of the initial substring
+ * that consists entirely of the complement
+ * of a set of specified bytes.
+ *
+ * @param string The string.
+ * @param stopset Bytes disallowed in the substring.
+ * @return The length of the substring.
+ */
+size_t strcspn(const char*, const char*)
+ __GCC_ONLY(__attribute__((warn_unused_result, nonnull)));
+
+/**
+ * This function works like `strcspn`,
+ * except it returns the pointer to the
+ * location of the first found non-matching
+ * byte.
+ *
+ * @param string The string.
+ * @param stopset Bytes disallowed in the substring.
+ * @return A pointer to the first occurrence in
+ * `string` of a byte found in `stopset`.
+ * `NULL` is returned if none is found.
+ */
+char* stpbrk(const char*, const char*)
+ __GCC_ONLY(__attribute__((warn_unused_result, nonnull)));
+
+
#endif
diff --git a/include/wchar.h b/include/wchar.h
index 16644c8..31e985d 100644
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -938,6 +938,46 @@ wchar_t* wmemmem(const wchar_t*, size_t, const wchar_t*, size_t)
/* TODO Add case right-to-left substring searching functions. */
+/**
+ * Returns length of the initial substring
+ * that consists entirely of a set of specified
+ * wide characters.
+ *
+ * @param string The string.
+ * @param skipset Characters allowed in the substring.
+ * @return The length of the substring.
+ */
+size_t wcsspn(const wchar_t*, const wchar_t*)
+ __GCC_ONLY(__attribute__((warn_unused_result, nonnull)));
+
+/**
+ * Returns length of the initial substring
+ * that consists entirely of the complement
+ * of a set of specified wide characters.
+ *
+ * @param string The string.
+ * @param stopset Characters disallowed in the substring.
+ * @return The length of the substring.
+ */
+size_t wcscspn(const wchar_t*, const wchar_t*)
+ __GCC_ONLY(__attribute__((warn_unused_result, nonnull)));
+
+/**
+ * This function works like `strcspn`,
+ * except it returns the pointer to the
+ * location of the first found non-matching
+ * wide character.
+ *
+ * @param string The string.
+ * @param stopset Bytes disallowed in the substring.
+ * @return A pointer to the first occurrence in
+ * `string` of a character found in `stopset`.
+ * `NULL` is returned if none is found.
+ */
+wchar_t* wcpbrk(const wchar_t*, const wchar_t*)
+ __GCC_ONLY(__attribute__((warn_unused_result, nonnull)));
+
+
#endif
#endif
diff --git a/src/string/strspn.c b/src/string/strspn.c
new file mode 100644
index 0000000..cf82529
--- /dev/null
+++ b/src/string/strspn.c
@@ -0,0 +1,96 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
+ *
+ * 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, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+#include <string.h>
+#include <stddef.h>
+
+
+
+/**
+ * Returns length of the initial substring
+ * that consists entirely of a set of specified
+ * bytes.
+ *
+ * @param string The string.
+ * @param skipset Bytes allowed in the substring.
+ * @return The length of the substring.
+ */
+size_t strspn(const char* string, const char* skipset)
+{
+ char set[256];
+ char c;
+ const char* s = string;
+ memset(set, 0, 256);
+ while ((c = *skipset++))
+ set[(size_t)c] = 1;
+ while ((c = *s++))
+ if (set[(size_t)c])
+ break;
+ return (size_t)(s - 1 - string);
+}
+
+
+/**
+ * Returns length of the initial substring
+ * that consists entirely of the complement
+ * of a set of specified bytes.
+ *
+ * @param string The string.
+ * @param stopset Bytes disallowed in the substring.
+ * @return The length of the substring.
+ */
+size_t strcspn(const char* string, const char* stopset)
+{
+ char set[256];
+ char c;
+ const char* s = string;
+ memset(set, 0, 256);
+ while ((c = *skipset++))
+ set[(size_t)c] = 1;
+ while ((c = *s++))
+ if (!set[(size_t)c])
+ break;
+ return (size_t)(s - 1 - string);
+}
+
+
+/**
+ * This function works like `strcspn`,
+ * except it returns the pointer to the
+ * location of the first found non-matching
+ * byte.
+ *
+ * @param string The string.
+ * @param stopset Bytes disallowed in the substring.
+ * @return A pointer to the first occurrence in
+ * `string` of a byte found in `stopset`.
+ * `NULL` is returned if none is found.
+ */
+char* stpbrk(const char* string, const char* stopset)
+{
+ char set[256];
+ char c;
+ const char* s = string;
+ memset(set, 0, 256);
+ while ((c = *skipset++))
+ set[(size_t)c] = 1;
+ while ((c = *s++))
+ if (!set[(size_t)c])
+ break;
+ return c ? (s - 1) : NULL;
+}
+
diff --git a/src/wchar/wcsspn.c b/src/wchar/wcsspn.c
new file mode 100644
index 0000000..360ab5f
--- /dev/null
+++ b/src/wchar/wcsspn.c
@@ -0,0 +1,81 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
+ *
+ * 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, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+#include <wchar.h>
+#include <stddef.h>
+
+
+
+/**
+ * Returns length of the initial substring
+ * that consists entirely of a set of specified
+ * wide characters.
+ *
+ * @param string The string.
+ * @param skipset Characters allowed in the substring.
+ * @return The length of the substring.
+ */
+size_t wcsspn(const wchar_t* string, const wchar_t* skipset)
+{
+ wchar_t* s = string;
+ wchar_t c;
+ while ((c = *s++))
+ if (wcschr(skipset, c) == NULL)
+ break;
+ return (size_t)(s - 1 - string);
+}
+
+
+/**
+ * Returns length of the initial substring
+ * that consists entirely of the complement
+ * of a set of specified wide characters.
+ *
+ * @param string The string.
+ * @param stopset Characters disallowed in the substring.
+ * @return The length of the substring.
+ */
+size_t wcscspn(const wchar_t* string, const wchar_t* stopset)
+{
+ size_t end = wcslen(string);
+ wchar_t* p;
+ wchar_t c;
+ while ((c = *skipset++))
+ if (p = wcsnchr(string, c, end), p != NULL)
+ end = (size_t)(p - string);
+ return end;
+}
+
+
+/**
+ * This function works like `strcspn`,
+ * except it returns the pointer to the
+ * location of the first found non-matching
+ * wide character.
+ *
+ * @param string The string.
+ * @param stopset Bytes disallowed in the substring.
+ * @return A pointer to the first occurrence in
+ * `string` of a character found in `stopset`.
+ * `NULL` is returned if none is found.
+ */
+wchar_t* wcpbrk(const wchar_t* string, const wchar_t* stopset)
+{
+ string += wcscspn(string, stopset);
+ return *string ? string : NULL;
+}
+