+/* 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>
/**
* @needle: a substring
*
* Example:
- * int i;
- * i = strcount("aaa aaa", "a"); // i = 6;
- * i = strcount("aaa aaa", "ab"); // i = 0;
- * i = strcount("aaa aaa", "aa"); // i = 2;
+ * 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
{
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);
#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))