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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286// SPDX-License-Identifier: GPL-2.0-only/* * linux/lib/cmdline.c * Helper functions generally used for parsing kernel command line * and module options. * * Code and copyrights come from init/main.c and arch/i386/kernel/setup.c. * * GNU Indent formatting options for this file: -kr -i8 -npsl -pcs */
#include <linux/export.h>#include <linux/kernel.h>#include <linux/string.h>#include <linux/ctype.h>
/* * If a hyphen was found in get_option, this will handle the * range of numbers, M-N. This will expand the range and insert * the values[M, M+1, ..., N] into the ints array in get_options. */
static int get_range(char **str, int *pint, int n){ int x, inc_counter, upper_range;
(*str)++; upper_range = simple_strtol((*str), NULL, 0); inc_counter = upper_range - *pint; for (x = *pint; n && x < upper_range; x++, n--) *pint++ = x; return inc_counter;}
/** * get_option - Parse integer from an option string * @str: option string * @pint: (optional output) integer value parsed from @str * * Read an int from an option string; if available accept a subsequent * comma as well. * * When @pint is NULL the function can be used as a validator of * the current option in the string. * * Return: * 0 - no int in string * 1 - int found, no subsequent comma * 2 - int found including a subsequent comma * 3 - hyphen found to denote a range * * Leading hyphen without integer is no integer case, but we consume it * for the sake of simplification. */
int get_option(char **str, int *pint){ char *cur = *str; int value;
if (!cur || !(*cur)) return 0; if (*cur == '-') value = -simple_strtoull(++cur, str, 0); else value = simple_strtoull(cur, str, 0); if (pint) *pint = value; if (cur == *str) return 0; if (**str == ',') { (*str)++; return 2; } if (**str == '-') return 3;
return 1;}EXPORT_SYMBOL(get_option);
/** * get_options - Parse a string into a list of integers * @str: String to be parsed * @nints: size of integer array * @ints: integer array (must have room for at least one element) * * This function parses a string containing a comma-separated * list of integers, a hyphen-separated range of _positive_ integers, * or a combination of both. The parse halts when the array is * full, or when no more numbers can be retrieved from the * string. * * When @nints is 0, the function just validates the given @str and * returns the amount of parseable integers as described below. * * Returns: * * The first element is filled by the number of collected integers * in the range. The rest is what was parsed from the @str. * * Return value is the character in the string which caused * the parse to end (typically a null terminator, if @str is * completely parseable). */
char *get_options(const char *str, int nints, int *ints){ bool validate = (nints == 0); int res, i = 1;
while (i < nints || validate) { int *pint = validate ? ints : ints + i;
res = get_option((char **)&str, pint); if (res == 0) break; if (res == 3) { int n = validate ? 0 : nints - i; int range_nums;
range_nums = get_range((char **)&str, pint, n); if (range_nums < 0) break; /* * Decrement the result by one to leave out the * last number in the range. The next iteration * will handle the upper number in the range */ i += (range_nums - 1); } i++; if (res == 1) break; } ints[0] = i - 1; return (char *)str;}EXPORT_SYMBOL(get_options);
/** * memparse - parse a string with mem suffixes into a number * @ptr: Where parse begins * @retptr: (output) Optional pointer to next char after parse completes * * Parses a string into a number. The number stored at @ptr is * potentially suffixed with K, M, G, T, P, E. * * Return: The value as recognized by simple_strtoull() multiplied * by the value as specified by suffix, if any. */
unsigned long long memparse(const char *ptr, char **retptr){ char *endptr; /* local pointer to end of parsed string */ unsigned long long ret = simple_strtoull(ptr, &endptr, 0); unsigned int shl = 0;
/* Consume valid suffix even in case of overflow. */ switch (*endptr) { case 'E': case 'e': shl += 10; fallthrough; case 'P': case 'p': shl += 10; fallthrough; case 'T': case 't': shl += 10; fallthrough; case 'G': case 'g': shl += 10; fallthrough; case 'M': case 'm': shl += 10; fallthrough; case 'K': case 'k': shl += 10; fallthrough; default: break; }
if (shl && likely(ptr != endptr)) { /* Have valid suffix with preceding number. */ if (unlikely(check_shl_overflow(ret, shl, &ret))) ret = ULLONG_MAX; endptr++; }
if (retptr) *retptr = endptr;
return ret;}EXPORT_SYMBOL(memparse);
/** * parse_option_str - Parse a string and check an option is set or not * @str: String to be parsed * @option: option name * * This function parses a string containing a comma-separated list of * strings like a=b,c. * * Return: True if there's such option in the string or false otherwise. */bool parse_option_str(const char *str, const char *option){ while (*str) { if (!strncmp(str, option, strlen(option))) { str += strlen(option); if (!*str || *str == ',') return true; }
while (*str && *str != ',') str++;
if (*str == ',') str++; }
return false;}
/* * Parse a string to get a param value pair. * You can use " around spaces, but can't escape ". * Hyphens and underscores equivalent in parameter names. */char *next_arg(char *args, char **param, char **val){ unsigned int i, equals = 0; int in_quote = 0, quoted = 0;
if (*args == '"') { args++; in_quote = 1; quoted = 1; }
for (i = 0; args[i]; i++) { if (isspace(args[i]) && !in_quote) break; if (equals == 0) { if (args[i] == '=') equals = i; } if (args[i] == '"') in_quote = !in_quote; }
*param = args; if (!equals) *val = NULL; else { args[equals] = '\0'; *val = args + equals + 1;
/* Don't include quotes in value. */ if (**val == '"') { (*val)++; if (args[i-1] == '"') args[i-1] = '\0'; } } if (quoted && i > 0 && args[i-1] == '"') args[i-1] = '\0';
if (args[i]) { args[i] = '\0'; args += i + 1; } else args += i;
/* Chew up trailing spaces. */ return skip_spaces(args);}EXPORT_SYMBOL(next_arg);