3e96ed44e8
Some environment variables provide a space-separated list of strings. It is easier to process these when they are broken out into an array of strings. Add a utility function to handle this. Signed-off-by: Simon Glass <sjg@chromium.org>
372 lines
13 KiB
C
372 lines
13 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* (C) Copyright 2000-2009
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*/
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#ifndef __VSPRINTF_H
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#define __VSPRINTF_H
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#include <stdarg.h>
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#include <linux/types.h>
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/**
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* simple_strtoul - convert a string to an unsigned long
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*
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* @cp: The string to be converted
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* @endp: Updated to point to the first character not converted
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* @base: The number base to use (0 for the default)
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* Return: value decoded from string (0 if invalid)
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*
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* Converts a string to an unsigned long. If there are invalid characters at
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* the end these are ignored. In the worst case, if all characters are invalid,
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* 0 is returned
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*
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* A hex prefix is supported (e.g. 0x123) regardless of the value of @base.
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* If found, the base is set to hex (16).
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*
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* If @base is 0:
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* - an octal '0' prefix (e.g. 0777) sets the base to octal (8).
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* - otherwise the base defaults to decimal (10).
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*/
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ulong simple_strtoul(const char *cp, char **endp, unsigned int base);
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/**
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* hex_strtoul - convert a string in hex to an unsigned long
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*
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* @cp: The string to be converted
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* @endp: Updated to point to the first character not converted
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* Return: value decoded from string (0 if invalid)
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*
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* Converts a hex string to an unsigned long. If there are invalid characters at
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* the end these are ignored. In the worst case, if all characters are invalid,
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* 0 is returned
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*/
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unsigned long hextoul(const char *cp, char **endp);
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/**
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* dec_strtoul - convert a string in decimal to an unsigned long
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*
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* @cp: The string to be converted
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* @endp: Updated to point to the first character not converted
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* Return: value decoded from string (0 if invalid)
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*
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* Converts a decimal string to an unsigned long. If there are invalid
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* characters at the end these are ignored. In the worst case, if all characters
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* are invalid, 0 is returned
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*/
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unsigned long dectoul(const char *cp, char **endp);
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/**
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* strict_strtoul - convert a string to an unsigned long strictly
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* @cp: The string to be converted
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* @base: The number base to use (0 for the default)
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* @res: The converted result value
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* Return: 0 if conversion is successful and `*res` is set to the converted
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* value, otherwise it returns -EINVAL and `*res` is set to 0.
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*
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* strict_strtoul converts a string to an unsigned long only if the
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* string is really an unsigned long string, any string containing
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* any invalid char at the tail will be rejected and -EINVAL is returned,
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* only a newline char at the tail is acceptible because people generally
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* change a module parameter in the following way:
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*
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* echo 1024 > /sys/module/e1000/parameters/copybreak
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*
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* echo will append a newline to the tail.
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*
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* A hex prefix is supported (e.g. 0x123) regardless of the value of @base.
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* If found, the base is set to hex (16).
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*
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* If @base is 0:
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* - an octal '0' prefix (e.g. 0777) sets the base to octal (8).
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* - otherwise the base defaults to decimal (10).
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*
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* Copied this function from Linux 2.6.38 commit ID:
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* 521cb40b0c44418a4fd36dc633f575813d59a43d
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*
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*/
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int strict_strtoul(const char *cp, unsigned int base, unsigned long *res);
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unsigned long long simple_strtoull(const char *cp, char **endp,
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unsigned int base);
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long simple_strtol(const char *cp, char **endp, unsigned int base);
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long long simple_strtoll(const char *cp, char **endp, unsigned int base);
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/**
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* trailing_strtol() - extract a trailing integer from a string
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*
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* Given a string this finds a trailing number on the string and returns it.
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* For example, "abc123" would return 123.
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*
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* Note that this does not handle a string without a prefix. See dectoul() for
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* that case.
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*
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* @str: String to examine
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* Return: trailing number if found, else -1
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*/
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long trailing_strtol(const char *str);
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/**
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* trailing_strtoln() - extract a trailing integer from a fixed-length string
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*
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* Given a fixed-length string this finds a trailing number on the string
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* and returns it. For example, "abc123" would return 123. Only the
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* characters between @str and @end - 1 are examined. If @end is NULL, it is
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* set to str + strlen(str).
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*
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* @str: String to examine
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* @end: Pointer to end of string to examine, or NULL to use the
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* whole string
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* Return: trailing number if found, else -1
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*/
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long trailing_strtoln(const char *str, const char *end);
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/**
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* trailing_strtoln_end() - extract trailing integer from a fixed-length string
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*
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* Given a fixed-length string this finds a trailing number on the string
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* and returns it. For example, "abc123" would return 123. Only the
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* characters between @str and @end - 1 are examined. If @end is NULL, it is
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* set to str + strlen(str).
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*
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* @str: String to examine
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* @end: Pointer to end of string to examine, or NULL to use the
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* whole string
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* @endp: If non-NULL, this is set to point to the character where the
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* number starts, e.g. for "mmc0" this would be point to the '0'; if no
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* trailing number is found, it is set to the end of the string
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* Return: training number if found, else -1
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*/
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long trailing_strtoln_end(const char *str, const char *end, char const **endp);
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/**
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* panic() - Print a message and reset/hang
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*
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* Prints a message on the console(s) and then resets. If CONFIG_PANIC_HANG is
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* defined, then it will hang instead of resetting.
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*
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* @fmt: printf() format string for message, which should not include
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* \n, followed by arguments
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*/
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void panic(const char *fmt, ...)
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__attribute__ ((format (__printf__, 1, 2), noreturn));
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/**
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* panic_str() - Print a message and reset/hang
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*
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* Prints a message on the console(s) and then resets. If CONFIG_PANIC_HANG is
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* defined, then it will hang instead of resetting.
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*
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* This function can be used instead of panic() when your board does not
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* already use printf(), * to keep code size small.
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*
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* @str: string to display, which should not include \n
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*/
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void panic_str(const char *str) __attribute__ ((noreturn));
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/**
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* Format a string and place it in a buffer
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*
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* @buf: The buffer to place the result into
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* @fmt: The format string to use
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* @...: Arguments for the format string
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*
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* The function returns the number of characters written
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* into @buf.
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*
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* See the vsprintf() documentation for format string extensions over C99.
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*/
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int sprintf(char *buf, const char *fmt, ...)
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__attribute__ ((format (__printf__, 2, 3)));
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/**
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* Format a string and place it in a buffer (va_list version)
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*
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* @buf: The buffer to place the result into
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* @fmt: The format string to use
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* @args: Arguments for the format string
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* Return: the number of characters which have been written into
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* the @buf not including the trailing '\0'.
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*
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* If you're not already dealing with a va_list consider using scnprintf().
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*
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* See the vsprintf() documentation for format string extensions over C99.
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*/
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int vsprintf(char *buf, const char *fmt, va_list args);
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/**
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* simple_itoa() - convert an unsigned integer to a string
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*
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* This returns a static string containing the decimal representation of the
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* given value. The returned value may be overwritten by other calls to other
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* simple... functions, so should be used immediately
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*
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* @val: Value to convert
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* Return: string containing the decimal representation of @val
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*/
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char *simple_itoa(ulong val);
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/**
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* simple_xtoa() - convert an unsigned integer to a hex string
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*
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* This returns a static string containing the hexadecimal representation of the
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* given value. The returned value may be overwritten by other calls to other
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* simple... functions, so should be used immediately
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*
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* @num: Value to convert
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* Return: string containing the hexecimal representation of @val
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*/
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char *simple_xtoa(ulong num);
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/**
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* Format a string and place it in a buffer
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*
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* @buf: The buffer to place the result into
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* @size: The size of the buffer, including the trailing null space
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* @fmt: The format string to use
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* @...: Arguments for the format string
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* Return: the number of characters which would be
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* generated for the given input, excluding the trailing null,
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* as per ISO C99. If the return is greater than or equal to
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* @size, the resulting string is truncated.
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*
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* See the vsprintf() documentation for format string extensions over C99.
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*/
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int snprintf(char *buf, size_t size, const char *fmt, ...)
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__attribute__ ((format (__printf__, 3, 4)));
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/**
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* Format a string and place it in a buffer
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*
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* @buf: The buffer to place the result into
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* @size: The size of the buffer, including the trailing null space
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* @fmt: The format string to use
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* @...: Arguments for the format string
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*
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* The return value is the number of characters written into @buf not including
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* the trailing '\0'. If @size is == 0 the function returns 0.
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*
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* See the vsprintf() documentation for format string extensions over C99.
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*/
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int scnprintf(char *buf, size_t size, const char *fmt, ...)
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__attribute__ ((format (__printf__, 3, 4)));
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/**
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* Format a string and place it in a buffer (base function)
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*
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* @buf: The buffer to place the result into
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* @size: The size of the buffer, including the trailing null space
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* @fmt: The format string to use
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* @args: Arguments for the format string
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* Return: The number characters which would be generated for the given
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* input, excluding the trailing '\0', as per ISO C99. Note that fewer
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* characters may be written if this number of characters is >= size.
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*
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* This function follows C99 vsnprintf, but has some extensions:
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* %pS output the name of a text symbol
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* %pF output the name of a function pointer
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* %pR output the address range in a struct resource
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*
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* The function returns the number of characters which would be
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* generated for the given input, excluding the trailing '\0',
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* as per ISO C99.
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*
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* Call this function if you are already dealing with a va_list.
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* You probably want snprintf() instead.
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*/
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int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
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/**
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* Format a string and place it in a buffer (va_list version)
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*
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* @buf: The buffer to place the result into
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* @size: The size of the buffer, including the trailing null space
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* @fmt: The format string to use
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* @args: Arguments for the format string
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* Return: the number of characters which have been written into
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* the @buf not including the trailing '\0'. If @size is == 0 the function
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* returns 0.
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*
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* If you're not already dealing with a va_list consider using scnprintf().
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*
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* See the vsprintf() documentation for format string extensions over C99.
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*/
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int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
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/**
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* print_grouped_ull() - print a value with digits grouped by ','
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*
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* This prints a value with grouped digits, like 12,345,678 to make it easier
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* to read.
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*
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* @int_val: Value to print
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* @digits: Number of digiits to print
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*/
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void print_grouped_ull(unsigned long long int_val, int digits);
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bool str2off(const char *p, loff_t *num);
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bool str2long(const char *p, ulong *num);
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/**
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* strmhz() - Convert a value to a Hz string
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*
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* This creates a string indicating the number of MHz of a value. For example,
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* 2700000 produces "2.7".
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* @buf: Buffer to hold output string, which must be large enough
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* @hz: Value to convert
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*/
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char *strmhz(char *buf, unsigned long hz);
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/**
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* str_to_upper() - Convert a string to upper case
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*
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* This simply uses toupper() on each character of the string.
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*
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* @in: String to convert (must be large enough to hold the output string)
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* @out: Buffer to put converted string
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* @len: Number of bytes available in @out (SIZE_MAX for all)
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*/
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void str_to_upper(const char *in, char *out, size_t len);
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/**
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* str_to_list() - Convert a string to a list of string pointers
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*
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* Splits a string containing space-delimited substrings into a number of
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* separate strings, e.g. "this is" becomes {"this", "is", NULL}. If @instr is
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* empty then this returns just {NULL}. The string should have only a single
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* space between items, with no leading or trailing spaces.
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*
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* @instr: String to process (this is alloced by this function)
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* Returns: List of string pointers, terminated by NULL. Each entry points to
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* a string. If @instr is empty, the list consists just of a single NULL entry.
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* Note that the first entry points to the alloced string.
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* Returns NULL if out of memory
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*/
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const char **str_to_list(const char *instr);
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/**
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* str_free_list() - Free a string list
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*
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* @ptr: String list to free, as created by str_to_list(). This can also be
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* NULL, in which case the function does nothing
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*/
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void str_free_list(const char **ptr);
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/**
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* vsscanf - Unformat a buffer into a list of arguments
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* @inp: input buffer
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* @fmt0: format of buffer
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* @ap: arguments
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*/
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int vsscanf(const char *inp, char const *fmt0, va_list ap);
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/**
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* sscanf - Unformat a buffer into a list of arguments
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* @buf: input buffer
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* @fmt: formatting of buffer
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* @...: resulting arguments
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*/
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int sscanf(const char *buf, const char *fmt, ...);
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#endif
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