1 /* CC0 (Public domain) - see LICENSE file for details */
11 * streq - Are two strings equal?
15 * This macro is arguably more readable than "!strcmp(a, b)".
18 * if (streq(somestring, ""))
19 * printf("String is empty!\n");
21 #define streq(a,b) (strcmp((a),(b)) == 0)
24 * strstarts - Does this string start with this prefix?
25 * @str: string to test
26 * @prefix: prefix to look for at start of str
29 * if (strstarts(somestring, "foo"))
30 * printf("String %s begins with 'foo'!\n", somestring);
32 #define strstarts(str,prefix) (strncmp((str),(prefix),strlen(prefix)) == 0)
35 * strends - Does this string end with this postfix?
36 * @str: string to test
37 * @postfix: postfix to look for at end of str
40 * if (strends(somestring, "foo"))
41 * printf("String %s end with 'foo'!\n", somestring);
43 static inline bool strends(const char *str, const char *postfix)
45 if (strlen(str) < strlen(postfix))
48 return streq(str + strlen(str) - strlen(postfix), postfix);
52 * stringify - Turn expression into a string literal
53 * @expr: any C expression
56 * #define PRINT_COND_IF_FALSE(cond) \
57 * ((cond) || printf("%s is false!", stringify(cond)))
59 #define stringify(expr) stringify_1(expr)
60 /* Double-indirection required to stringify expansions */
61 #define stringify_1(expr) #expr
64 * strcount - Count number of (non-overlapping) occurrences of a substring.
65 * @haystack: a C string
66 * @needle: a substring
69 * assert(strcount("aaa aaa", "a") == 6);
70 * assert(strcount("aaa aaa", "ab") == 0);
71 * assert(strcount("aaa aaa", "aa") == 2);
73 size_t strcount(const char *haystack, const char *needle);
76 * STR_MAX_CHARS - Maximum possible size of numeric string for this type.
77 * @type_or_expr: a pointer or integer type or expression.
79 * This provides enough space for a nul-terminated string which represents the
80 * largest possible value for the type or expression.
82 * Note: The implementation adds extra space so hex values or negative
83 * values will fit (eg. sprintf(... "%p"). )
86 * char str[STR_MAX_CHARS(int)];
88 * sprintf(str, "%i", 7);
90 #define STR_MAX_CHARS(type_or_expr) \
91 ((sizeof(type_or_expr) * CHAR_BIT + 8) / 9 * 3 + 2 \
92 + STR_MAX_CHARS_TCHECK_(type_or_expr))
95 /* Only a simple type can have 0 assigned, so test that. */
96 #define STR_MAX_CHARS_TCHECK_(type_or_expr) \
97 (sizeof(({ typeof(type_or_expr) x = 0; x; }))*0)
99 #define STR_MAX_CHARS_TCHECK_(type_or_expr) 0
103 * cisalnum - isalnum() which takes a char (and doesn't accept EOF)
106 * Surprisingly, the standard ctype.h isalnum() takes an int, which
107 * must have the value of EOF (-1) or an unsigned char. This variant
108 * takes a real char, and doesn't accept EOF.
110 static inline bool cisalnum(char c)
112 return isalnum((unsigned char)c);
114 static inline bool cisalpha(char c)
116 return isalpha((unsigned char)c);
118 static inline bool cisascii(char c)
120 return isascii((unsigned char)c);
123 static inline bool cisblank(char c)
125 return isblank((unsigned char)c);
128 static inline bool ciscntrl(char c)
130 return iscntrl((unsigned char)c);
132 static inline bool cisdigit(char c)
134 return isdigit((unsigned char)c);
136 static inline bool cisgraph(char c)
138 return isgraph((unsigned char)c);
140 static inline bool cislower(char c)
142 return islower((unsigned char)c);
144 static inline bool cisprint(char c)
146 return isprint((unsigned char)c);
148 static inline bool cispunct(char c)
150 return ispunct((unsigned char)c);
152 static inline bool cisspace(char c)
154 return isspace((unsigned char)c);
156 static inline bool cisupper(char c)
158 return isupper((unsigned char)c);
160 static inline bool cisxdigit(char c)
162 return isxdigit((unsigned char)c);
165 #include <ccan/str/str_debug.h>
167 /* These checks force things out of line, hence they are under DEBUG. */
168 #ifdef CCAN_STR_DEBUG
169 #include <ccan/build_assert/build_assert.h>
171 /* These are commonly misused: they take -1 or an *unsigned* char value. */
186 /* You can use a char if char is unsigned. */
187 #if HAVE_BUILTIN_TYPES_COMPATIBLE_P && HAVE_TYPEOF
188 #define str_check_arg_(i) \
189 ((i) + BUILD_ASSERT_OR_ZERO(!__builtin_types_compatible_p(typeof(i), \
193 #define str_check_arg_(i) (i)
196 #define isalnum(i) str_isalnum(str_check_arg_(i))
197 #define isalpha(i) str_isalpha(str_check_arg_(i))
198 #define isascii(i) str_isascii(str_check_arg_(i))
200 #define isblank(i) str_isblank(str_check_arg_(i))
202 #define iscntrl(i) str_iscntrl(str_check_arg_(i))
203 #define isdigit(i) str_isdigit(str_check_arg_(i))
204 #define isgraph(i) str_isgraph(str_check_arg_(i))
205 #define islower(i) str_islower(str_check_arg_(i))
206 #define isprint(i) str_isprint(str_check_arg_(i))
207 #define ispunct(i) str_ispunct(str_check_arg_(i))
208 #define isspace(i) str_isspace(str_check_arg_(i))
209 #define isupper(i) str_isupper(str_check_arg_(i))
210 #define isxdigit(i) str_isxdigit(str_check_arg_(i))
213 /* With GNU magic, we can make const-respecting standard string functions. */
218 /* + 0 is needed to decay array into pointer. */
219 #define strstr(haystack, needle) \
220 ((typeof((haystack) + 0))str_strstr((haystack), (needle)))
221 #define strchr(haystack, c) \
222 ((typeof((haystack) + 0))str_strchr((haystack), (c)))
223 #define strrchr(haystack, c) \
224 ((typeof((haystack) + 0))str_strrchr((haystack), (c)))
226 #endif /* CCAN_STR_DEBUG */
228 #endif /* CCAN_STR_H */