1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * (C) Copyright 2000-2009
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
11 #include <linux/types.h>
14 * simple_strtoul - convert a string to an unsigned long
16 * @cp: The string to be converted
17 * @endp: Updated to point to the first character not converted
18 * @base: The number base to use (0 for the default)
19 * Return: value decoded from string (0 if invalid)
21 * Converts a string to an unsigned long. If there are invalid characters at
22 * the end these are ignored. In the worst case, if all characters are invalid,
25 * A hex prefix is supported (e.g. 0x123) regardless of the value of @base.
26 * If found, the base is set to hex (16).
29 * - an octal '0' prefix (e.g. 0777) sets the base to octal (8).
30 * - otherwise the base defaults to decimal (10).
32 ulong simple_strtoul(const char *cp, char **endp, unsigned int base);
35 * hex_strtoul - convert a string in hex to an unsigned long
37 * @cp: The string to be converted
38 * @endp: Updated to point to the first character not converted
39 * Return: value decoded from string (0 if invalid)
41 * Converts a hex string to an unsigned long. If there are invalid characters at
42 * the end these are ignored. In the worst case, if all characters are invalid,
45 unsigned long hextoul(const char *cp, char **endp);
48 * dec_strtoul - convert a string in decimal to an unsigned long
50 * @cp: The string to be converted
51 * @endp: Updated to point to the first character not converted
52 * Return: value decoded from string (0 if invalid)
54 * Converts a decimal string to an unsigned long. If there are invalid
55 * characters at the end these are ignored. In the worst case, if all characters
56 * are invalid, 0 is returned
58 unsigned long dectoul(const char *cp, char **endp);
61 * strict_strtoul - convert a string to an unsigned long strictly
62 * @cp: The string to be converted
63 * @base: The number base to use (0 for the default)
64 * @res: The converted result value
65 * Return: 0 if conversion is successful and `*res` is set to the converted
66 * value, otherwise it returns -EINVAL and `*res` is set to 0.
68 * strict_strtoul converts a string to an unsigned long only if the
69 * string is really an unsigned long string, any string containing
70 * any invalid char at the tail will be rejected and -EINVAL is returned,
71 * only a newline char at the tail is acceptible because people generally
72 * change a module parameter in the following way:
74 * echo 1024 > /sys/module/e1000/parameters/copybreak
76 * echo will append a newline to the tail.
78 * A hex prefix is supported (e.g. 0x123) regardless of the value of @base.
79 * If found, the base is set to hex (16).
82 * - an octal '0' prefix (e.g. 0777) sets the base to octal (8).
83 * - otherwise the base defaults to decimal (10).
85 * Copied this function from Linux 2.6.38 commit ID:
86 * 521cb40b0c44418a4fd36dc633f575813d59a43d
89 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res);
90 unsigned long long simple_strtoull(const char *cp, char **endp,
92 long simple_strtol(const char *cp, char **endp, unsigned int base);
93 long long simple_strtoll(const char *cp, char **endp, unsigned int base);
96 * trailing_strtol() - extract a trailing integer from a string
98 * Given a string this finds a trailing number on the string and returns it.
99 * For example, "abc123" would return 123.
101 * Note that this does not handle a string without a prefix. See dectoul() for
104 * @str: String to examine
105 * Return: trailing number if found, else -1
107 long trailing_strtol(const char *str);
110 * trailing_strtoln() - extract a trailing integer from a fixed-length string
112 * Given a fixed-length string this finds a trailing number on the string
113 * and returns it. For example, "abc123" would return 123. Only the
114 * characters between @str and @end - 1 are examined. If @end is NULL, it is
115 * set to str + strlen(str).
117 * @str: String to examine
118 * @end: Pointer to end of string to examine, or NULL to use the
120 * Return: trailing number if found, else -1
122 long trailing_strtoln(const char *str, const char *end);
125 * panic() - Print a message and reset/hang
127 * Prints a message on the console(s) and then resets. If CONFIG_PANIC_HANG is
128 * defined, then it will hang instead of resetting.
130 * @fmt: printf() format string for message, which should not include
131 * \n, followed by arguments
133 void panic(const char *fmt, ...)
134 __attribute__ ((format (__printf__, 1, 2), noreturn));
137 * panic_str() - Print a message and reset/hang
139 * Prints a message on the console(s) and then resets. If CONFIG_PANIC_HANG is
140 * defined, then it will hang instead of resetting.
142 * This function can be used instead of panic() when your board does not
143 * already use printf(), * to keep code size small.
145 * @str: string to display, which should not include \n
147 void panic_str(const char *str) __attribute__ ((noreturn));
150 * Format a string and place it in a buffer
152 * @buf: The buffer to place the result into
153 * @fmt: The format string to use
154 * @...: Arguments for the format string
156 * The function returns the number of characters written
159 * See the vsprintf() documentation for format string extensions over C99.
161 int sprintf(char *buf, const char *fmt, ...)
162 __attribute__ ((format (__printf__, 2, 3)));
165 * Format a string and place it in a buffer (va_list version)
167 * @buf: The buffer to place the result into
168 * @fmt: The format string to use
169 * @args: Arguments for the format string
170 * Return: the number of characters which have been written into
171 * the @buf not including the trailing '\0'.
173 * If you're not already dealing with a va_list consider using scnprintf().
175 * See the vsprintf() documentation for format string extensions over C99.
177 int vsprintf(char *buf, const char *fmt, va_list args);
180 * simple_itoa() - convert an unsigned integer to a string
182 * This returns a static string containing the decimal representation of the
183 * given value. The returned value may be overwritten by other calls to other
184 * simple... functions, so should be used immediately
186 * @val: Value to convert
187 * Return: string containing the decimal representation of @val
189 char *simple_itoa(ulong val);
192 * simple_xtoa() - convert an unsigned integer to a hex string
194 * This returns a static string containing the hexadecimal representation of the
195 * given value. The returned value may be overwritten by other calls to other
196 * simple... functions, so should be used immediately
198 * @num: Value to convert
199 * Return: string containing the hexecimal representation of @val
201 char *simple_xtoa(ulong num);
204 * Format a string and place it in a buffer
206 * @buf: The buffer to place the result into
207 * @size: The size of the buffer, including the trailing null space
208 * @fmt: The format string to use
209 * @...: Arguments for the format string
210 * Return: the number of characters which would be
211 * generated for the given input, excluding the trailing null,
212 * as per ISO C99. If the return is greater than or equal to
213 * @size, the resulting string is truncated.
215 * See the vsprintf() documentation for format string extensions over C99.
217 int snprintf(char *buf, size_t size, const char *fmt, ...)
218 __attribute__ ((format (__printf__, 3, 4)));
221 * Format a string and place it in a buffer
223 * @buf: The buffer to place the result into
224 * @size: The size of the buffer, including the trailing null space
225 * @fmt: The format string to use
226 * @...: Arguments for the format string
228 * The return value is the number of characters written into @buf not including
229 * the trailing '\0'. If @size is == 0 the function returns 0.
231 * See the vsprintf() documentation for format string extensions over C99.
233 int scnprintf(char *buf, size_t size, const char *fmt, ...)
234 __attribute__ ((format (__printf__, 3, 4)));
237 * Format a string and place it in a buffer (base function)
239 * @buf: The buffer to place the result into
240 * @size: The size of the buffer, including the trailing null space
241 * @fmt: The format string to use
242 * @args: Arguments for the format string
243 * Return: The number characters which would be generated for the given
244 * input, excluding the trailing '\0', as per ISO C99. Note that fewer
245 * characters may be written if this number of characters is >= size.
247 * This function follows C99 vsnprintf, but has some extensions:
248 * %pS output the name of a text symbol
249 * %pF output the name of a function pointer
250 * %pR output the address range in a struct resource
252 * The function returns the number of characters which would be
253 * generated for the given input, excluding the trailing '\0',
256 * Call this function if you are already dealing with a va_list.
257 * You probably want snprintf() instead.
259 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
262 * Format a string and place it in a buffer (va_list version)
264 * @buf: The buffer to place the result into
265 * @size: The size of the buffer, including the trailing null space
266 * @fmt: The format string to use
267 * @args: Arguments for the format string
268 * Return: the number of characters which have been written into
269 * the @buf not including the trailing '\0'. If @size is == 0 the function
272 * If you're not already dealing with a va_list consider using scnprintf().
274 * See the vsprintf() documentation for format string extensions over C99.
276 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
279 * print_grouped_ull() - print a value with digits grouped by ','
281 * This prints a value with grouped digits, like 12,345,678 to make it easier
284 * @int_val: Value to print
285 * @digits: Number of digiits to print
287 void print_grouped_ull(unsigned long long int_val, int digits);
289 bool str2off(const char *p, loff_t *num);
290 bool str2long(const char *p, ulong *num);
293 * strmhz() - Convert a value to a Hz string
295 * This creates a string indicating the number of MHz of a value. For example,
296 * 2700000 produces "2.7".
297 * @buf: Buffer to hold output string, which must be large enough
298 * @hz: Value to convert
300 char *strmhz(char *buf, unsigned long hz);
303 * str_to_upper() - Convert a string to upper case
305 * This simply uses toupper() on each character of the string.
307 * @in: String to convert (must be large enough to hold the output string)
308 * @out: Buffer to put converted string
309 * @len: Number of bytes available in @out (SIZE_MAX for all)
311 void str_to_upper(const char *in, char *out, size_t len);
314 * vsscanf - Unformat a buffer into a list of arguments
316 * @fmt0: format of buffer
319 int vsscanf(const char *inp, char const *fmt0, va_list ap);
322 * sscanf - Unformat a buffer into a list of arguments
324 * @fmt: formatting of buffer
325 * @...: resulting arguments
327 int sscanf(const char *buf, const char *fmt, ...);