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/* 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?
* @a: first string
* @b: first string
*
* This macro is arguably more readable than "!strcmp(a, b)".
*
* Example:
* if (streq(somestring, ""))
* printf("String is empty!\n");
*/
#define streq(a,b) (strcmp((a),(b)) == 0)
/**
* strstarts - Does this string start with this prefix?
* @str: string to test
* @prefix: prefix to look for at start of str
*
* Example:
* if (strstarts(somestring, "foo"))
* printf("String %s begins with 'foo'!\n", somestring);
*/
#define strstarts(str,prefix) (strncmp((str),(prefix),strlen(prefix)) == 0)
/**
* strends - Does this string end with this postfix?
* @str: string to test
* @postfix: postfix to look for at end of str
*
* Example:
* if (strends(somestring, "foo"))
* printf("String %s end with 'foo'!\n", somestring);
*/
static inline bool strends(const char *str, const char *postfix)
{
if (strlen(str) < strlen(postfix))
return false;
return streq(str + strlen(str) - strlen(postfix), postfix);
}
/**
* stringify - Turn expression into a string literal
* @expr: any C expression
*
* Example:
* #define PRINT_COND_IF_FALSE(cond) \
* ((cond) || printf("%s is false!", stringify(cond)))
*/
#define stringify(expr) stringify_1(expr)
/* Double-indirection required to stringify expansions */
#define stringify_1(expr) #expr
/**
* strcount - Count number of (non-overlapping) occurrences of a substring.
* @haystack: a C string
* @needle: a substring
*
* Example:
* 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) \
({ typeof(type_or_expr) x = 0; (void)x; 0; })
#else
#define STR_MAX_CHARS_TCHECK_(type_or_expr) 0
#endif
/* These checks force things out of line, hence they are under DEBUG. */
#ifdef CCAN_STR_DEBUG
#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 */
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