+/* CC0 (Public domain) - see LICENSE file for details */
#ifndef CCAN_STR_H
#define CCAN_STR_H
+#include "config.h"
#include <string.h>
#include <stdbool.h>
+#include <limits.h>
+#include <ctype.h>
/**
* streq - Are two strings equal?
* @needle: a substring
*
* Example:
- * #define PRINT_COND_IF_FALSE(cond) \
- * ((cond) || printf("%s is false!", stringify(cond)))
+ * assert(strcount("aaa aaa", "a") == 6);
+ * assert(strcount("aaa aaa", "ab") == 0);
+ * assert(strcount("aaa aaa", "aa") == 2);
*/
size_t strcount(const char *haystack, const char *needle);
+/**
+ * STR_MAX_CHARS - Maximum possible size of numeric string for this type.
+ * @type_or_expr: a pointer or integer type or expression.
+ *
+ * This provides enough space for a nul-terminated string which represents the
+ * largest possible value for the type or expression.
+ *
+ * Note: The implementation adds extra space so hex values or negative
+ * values will fit (eg. sprintf(... "%p"). )
+ *
+ * Example:
+ * char str[STR_MAX_CHARS(int)];
+ *
+ * sprintf(str, "%i", 7);
+ */
+#define STR_MAX_CHARS(type_or_expr) \
+ ((sizeof(type_or_expr) * CHAR_BIT + 8) / 9 * 3 + 2 \
+ + STR_MAX_CHARS_TCHECK_(type_or_expr))
+
+#if HAVE_TYPEOF
+/* Only a simple type can have 0 assigned, so test that. */
+#define STR_MAX_CHARS_TCHECK_(type_or_expr) \
+ (sizeof(({ typeof(type_or_expr) x = 0; x; }))*0)
+#else
+#define STR_MAX_CHARS_TCHECK_(type_or_expr) 0
+#endif
+
+/**
+ * cisalnum - isalnum() which takes a char (and doesn't accept EOF)
+ * @c: a character
+ *
+ * Surprisingly, the standard ctype.h isalnum() takes an int, which
+ * must have the value of EOF (-1) or an unsigned char. This variant
+ * takes a real char, and doesn't accept EOF.
+ */
+static inline bool cisalnum(char c)
+{
+ return isalnum((unsigned char)c);
+}
+static inline bool cisalpha(char c)
+{
+ return isalpha((unsigned char)c);
+}
+static inline bool cisascii(char c)
+{
+ return isascii((unsigned char)c);
+}
+#if HAVE_ISBLANK
+static inline bool cisblank(char c)
+{
+ return isblank((unsigned char)c);
+}
+#endif
+static inline bool ciscntrl(char c)
+{
+ return iscntrl((unsigned char)c);
+}
+static inline bool cisdigit(char c)
+{
+ return isdigit((unsigned char)c);
+}
+static inline bool cisgraph(char c)
+{
+ return isgraph((unsigned char)c);
+}
+static inline bool cislower(char c)
+{
+ return islower((unsigned char)c);
+}
+static inline bool cisprint(char c)
+{
+ return isprint((unsigned char)c);
+}
+static inline bool cispunct(char c)
+{
+ return ispunct((unsigned char)c);
+}
+static inline bool cisspace(char c)
+{
+ return isspace((unsigned char)c);
+}
+static inline bool cisupper(char c)
+{
+ return isupper((unsigned char)c);
+}
+static inline bool cisxdigit(char c)
+{
+ return isxdigit((unsigned char)c);
+}
+
+#include <ccan/str/str_debug.h>
+
+/* These checks force things out of line, hence they are under DEBUG. */
+#ifdef CCAN_STR_DEBUG
+#include <ccan/build_assert/build_assert.h>
+
+/* These are commonly misused: they take -1 or an *unsigned* char value. */
+#undef isalnum
+#undef isalpha
+#undef isascii
+#undef isblank
+#undef iscntrl
+#undef isdigit
+#undef isgraph
+#undef islower
+#undef isprint
+#undef ispunct
+#undef isspace
+#undef isupper
+#undef isxdigit
+
+/* You can use a char if char is unsigned. */
+#if HAVE_BUILTIN_TYPES_COMPATIBLE_P && HAVE_TYPEOF
+#define str_check_arg_(i) \
+ ((i) + BUILD_ASSERT_OR_ZERO(!__builtin_types_compatible_p(typeof(i), \
+ char) \
+ || (char)255 > 0))
+#else
+#define str_check_arg_(i) (i)
+#endif
+
+#define isalnum(i) str_isalnum(str_check_arg_(i))
+#define isalpha(i) str_isalpha(str_check_arg_(i))
+#define isascii(i) str_isascii(str_check_arg_(i))
+#if HAVE_ISBLANK
+#define isblank(i) str_isblank(str_check_arg_(i))
+#endif
+#define iscntrl(i) str_iscntrl(str_check_arg_(i))
+#define isdigit(i) str_isdigit(str_check_arg_(i))
+#define isgraph(i) str_isgraph(str_check_arg_(i))
+#define islower(i) str_islower(str_check_arg_(i))
+#define isprint(i) str_isprint(str_check_arg_(i))
+#define ispunct(i) str_ispunct(str_check_arg_(i))
+#define isspace(i) str_isspace(str_check_arg_(i))
+#define isupper(i) str_isupper(str_check_arg_(i))
+#define isxdigit(i) str_isxdigit(str_check_arg_(i))
+
+#if HAVE_TYPEOF
+/* With GNU magic, we can make const-respecting standard string functions. */
+#undef strstr
+#undef strchr
+#undef strrchr
+
+/* + 0 is needed to decay array into pointer. */
+#define strstr(haystack, needle) \
+ ((typeof((haystack) + 0))str_strstr((haystack), (needle)))
+#define strchr(haystack, c) \
+ ((typeof((haystack) + 0))str_strchr((haystack), (c)))
+#define strrchr(haystack, c) \
+ ((typeof((haystack) + 0))str_strrchr((haystack), (c)))
+#endif
+#endif /* CCAN_STR_DEBUG */
+
#endif /* CCAN_STR_H */