diff options
| -rw-r--r-- | include/linux/kernel.h | 17 | ||||
| -rw-r--r-- | include/linux/string.h | 7 | ||||
| -rw-r--r-- | kernel/printk.c | 7 | ||||
| -rw-r--r-- | lib/Kconfig | 3 | ||||
| -rw-r--r-- | lib/vsprintf.c | 1005 |
5 files changed, 810 insertions, 229 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 556d781e69fe..cff58e288a22 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -242,6 +242,19 @@ extern struct ratelimit_state printk_ratelimit_state; extern int printk_ratelimit(void); extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, unsigned int interval_msec); + +/* + * Print a one-time message (analogous to WARN_ONCE() et al): + */ +#define printk_once(x...) ({ \ + static int __print_once = 1; \ + \ + if (__print_once) { \ + __print_once = 0; \ + printk(x); \ + } \ +}) + void log_buf_kexec_setup(void); #else static inline int vprintk(const char *s, va_list args) @@ -254,6 +267,10 @@ static inline int printk_ratelimit(void) { return 0; } static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \ unsigned int interval_msec) \ { return false; } + +/* No effect, but we still get type checking even in the !PRINTK case: */ +#define printk_once(x...) printk(x) + static inline void log_buf_kexec_setup(void) { } diff --git a/include/linux/string.h b/include/linux/string.h index 8852739f36df..3c877d686375 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -10,6 +10,7 @@ #include <linux/compiler.h> /* for inline */ #include <linux/types.h> /* for size_t */ #include <linux/stddef.h> /* for NULL */ +#include <stdarg.h> extern char *strndup_user(const char __user *, long); extern void *memdup_user(const void __user *, size_t); @@ -112,6 +113,12 @@ extern void argv_free(char **argv); extern bool sysfs_streq(const char *s1, const char *s2); +#ifdef CONFIG_BINARY_PRINTF +int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args); +int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf); +int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) __printf(3, 4); +#endif + extern ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos, const void *from, size_t available); diff --git a/kernel/printk.c b/kernel/printk.c index a5f61a9acedb..5052b5497c67 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -1311,8 +1311,11 @@ EXPORT_SYMBOL(printk_ratelimit); bool printk_timed_ratelimit(unsigned long *caller_jiffies, unsigned int interval_msecs) { - if (*caller_jiffies == 0 || time_after(jiffies, *caller_jiffies)) { - *caller_jiffies = jiffies + msecs_to_jiffies(interval_msecs); + if (*caller_jiffies == 0 + || !time_in_range(jiffies, *caller_jiffies, + *caller_jiffies + + msecs_to_jiffies(interval_msecs))) { + *caller_jiffies = jiffies; return true; } return false; diff --git a/lib/Kconfig b/lib/Kconfig index 2a9c69f34482..8ade0a7a91e0 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -2,6 +2,9 @@ # Library configuration # +config BINARY_PRINTF + def_bool n + menu "Library routines" config BITREVERSE diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 0fbd0121d91d..be3001f912e4 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -396,7 +396,38 @@ static noinline char* put_dec(char *buf, unsigned long long num) #define SMALL 32 /* Must be 32 == 0x20 */ #define SPECIAL 64 /* 0x */ -static char *number(char *buf, char *end, unsigned long long num, int base, int size, int precision, int type) +enum format_type { + FORMAT_TYPE_NONE, /* Just a string part */ + FORMAT_TYPE_WIDTH, + FORMAT_TYPE_PRECISION, + FORMAT_TYPE_CHAR, + FORMAT_TYPE_STR, + FORMAT_TYPE_PTR, + FORMAT_TYPE_PERCENT_CHAR, + FORMAT_TYPE_INVALID, + FORMAT_TYPE_LONG_LONG, + FORMAT_TYPE_ULONG, + FORMAT_TYPE_LONG, + FORMAT_TYPE_USHORT, + FORMAT_TYPE_SHORT, + FORMAT_TYPE_UINT, + FORMAT_TYPE_INT, + FORMAT_TYPE_NRCHARS, + FORMAT_TYPE_SIZE_T, + FORMAT_TYPE_PTRDIFF +}; + +struct printf_spec { + enum format_type type; + int flags; /* flags to number() */ + int field_width; /* width of output field */ + int base; + int precision; /* # of digits/chars */ + int qualifier; +}; + +static char *number(char *buf, char *end, unsigned long long num, + struct printf_spec spec) { /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ @@ -404,32 +435,32 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int char tmp[66]; char sign; char locase; - int need_pfx = ((type & SPECIAL) && base != 10); + int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); int i; /* locase = 0 or 0x20. ORing digits or letters with 'locase' * produces same digits or (maybe lowercased) letters */ - locase = (type & SMALL); - if (type & LEFT) - type &= ~ZEROPAD; + locase = (spec.flags & SMALL); + if (spec.flags & LEFT) + spec.flags &= ~ZEROPAD; sign = 0; - if (type & SIGN) { + if (spec.flags & SIGN) { if ((signed long long) num < 0) { sign = '-'; num = - (signed long long) num; - size--; - } else if (type & PLUS) { + spec.field_width--; + } else if (spec.flags & PLUS) { sign = '+'; - size--; - } else if (type & SPACE) { + spec.field_width--; + } else if (spec.flags & SPACE) { sign = ' '; - size--; + spec.field_width--; } } if (need_pfx) { - size--; - if (base == 16) - size--; + spec.field_width--; + if (spec.base == 16) + spec.field_width--; } /* generate full string in tmp[], in reverse order */ @@ -441,10 +472,10 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int tmp[i++] = (digits[do_div(num,base)] | locase); } while (num != 0); */ - else if (base != 10) { /* 8 or 16 */ - int mask = base - 1; + else if (spec.base != 10) { /* 8 or 16 */ + int mask = spec.base - 1; int shift = 3; - if (base == 16) shift = 4; + if (spec.base == 16) shift = 4; do { tmp[i++] = (digits[((unsigned char)num) & mask] | locase); num >>= shift; @@ -454,12 +485,12 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int } /* printing 100 using %2d gives "100", not "00" */ - if (i > precision) - precision = i; + if (i > spec.precision) + spec.precision = i; /* leading space padding */ - size -= precision; - if (!(type & (ZEROPAD+LEFT))) { - while(--size >= 0) { + spec.field_width -= spec.precision; + if (!(spec.flags & (ZEROPAD+LEFT))) { + while(--spec.field_width >= 0) { if (buf < end) *buf = ' '; ++buf; @@ -476,23 +507,23 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int if (buf < end) *buf = '0'; ++buf; - if (base == 16) { + if (spec.base == 16) { if (buf < end) *buf = ('X' | locase); ++buf; } } /* zero or space padding */ - if (!(type & LEFT)) { - char c = (type & ZEROPAD) ? '0' : ' '; - while (--size >= 0) { + if (!(spec.flags & LEFT)) { + char c = (spec.flags & ZEROPAD) ? '0' : ' '; + while (--spec.field_width >= 0) { if (buf < end) *buf = c; ++buf; } } /* hmm even more zero padding? */ - while (i <= --precision) { + while (i <= --spec.precision) { if (buf < end) *buf = '0'; ++buf; @@ -504,7 +535,7 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int ++buf; } /* trailing space padding */ - while (--size >= 0) { + while (--spec.field_width >= 0) { if (buf < end) *buf = ' '; ++buf; @@ -512,17 +543,17 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int return buf; } -static char *string(char *buf, char *end, char *s, int field_width, int precision, int flags) +static char *string(char *buf, char *end, char *s, struct printf_spec spec) { int len, i; if ((unsigned long)s < PAGE_SIZE) s = "<NULL>"; - len = strnlen(s, precision); + len = strnlen(s, spec.precision); - if (!(flags & LEFT)) { - while (len < field_width--) { + if (!(spec.flags & LEFT)) { + while (len < spec.field_width--) { if (buf < end) *buf = ' '; ++buf; @@ -533,7 +564,7 @@ static char *string(char *buf, char *end, char *s, int field_width, int precisio *buf = *s; ++buf; ++s; } - while (len < field_width--) { + while (len < spec.field_width--) { if (buf < end) *buf = ' '; ++buf; @@ -541,21 +572,24 @@ static char *string(char *buf, char *end, char *s, int field_width, int precisio return buf; } -static char *symbol_string(char *buf, char *end, void *ptr, int field_width, int precision, int flags) +static char *symbol_string(char *buf, char *end, void *ptr, + struct printf_spec spec) { unsigned long value = (unsigned long) ptr; #ifdef CONFIG_KALLSYMS char sym[KSYM_SYMBOL_LEN]; sprint_symbol(sym, value); - return string(buf, end, sym, field_width, precision, flags); + return string(buf, end, sym, spec); #else - field_width = 2*sizeof(void *); - flags |= SPECIAL | SMALL | ZEROPAD; - return number(buf, end, value, 16, field_width, precision, flags); + spec.field_width = 2*sizeof(void *); + spec.flags |= SPECIAL | SMALL | ZEROPAD; + spec.base = 16; + return number(buf, end, value, spec); #endif } -static char *resource_string(char *buf, char *end, struct resource *res, int field_width, int precision, int flags) +static char *resource_string(char *buf, char *end, struct resource *res, + struct printf_spec spec) { #ifndef IO_RSRC_PRINTK_SIZE #define IO_RSRC_PRINTK_SIZE 4 @@ -564,7 +598,11 @@ static char *resource_string(char *buf, char *end, struct resource *res, int fie #ifndef MEM_RSRC_PRINTK_SIZE #define MEM_RSRC_PRINTK_SIZE 8 #endif - + struct printf_spec num_spec = { + .base = 16, + .precision = -1, + .flags = SPECIAL | SMALL | ZEROPAD, + }; /* room for the actual numbers, the two "0x", -, [, ] and the final zero */ char sym[4*sizeof(resource_size_t) + 8]; char *p = sym, *pend = sym + sizeof(sym); @@ -576,17 +614,18 @@ static char *resource_string(char *buf, char *end, struct resource *res, int fie size = MEM_RSRC_PRINTK_SIZE; *p++ = '['; - p = number(p, pend, res->start, 16, size, -1, SPECIAL | SMALL | ZEROPAD); + num_spec.field_width = size; + p = number(p, pend, res->start, num_spec); *p++ = '-'; - p = number(p, pend, res->end, 16, size, -1, SPECIAL | SMALL | ZEROPAD); + p = number(p, pend, res->end, num_spec); *p++ = ']'; *p = 0; - return string(buf, end, sym, field_width, precision, flags); + return string(buf, end, sym, spec); } -static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width, - int precision, int flags) +static char *mac_address_string(char *buf, char *end, u8 *addr, + struct printf_spec spec) { char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */ char *p = mac_addr; @@ -594,16 +633,17 @@ static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width, for (i = 0; i < 6; i++) { p = pack_hex_byte(p, addr[i]); - if (!(flags & SPECIAL) && i != 5) + if (!(spec.flags & SPECIAL) && i != 5) *p++ = ':'; } *p = '\0'; + spec.flags &= ~SPECIAL; - return string(buf, end, mac_addr, field_width, precision, flags & ~SPECIAL); + return string(buf, end, mac_addr, spec); } -static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width, - int precision, int flags) +static char *ip6_addr_string(char *buf, char *end, u8 *addr, + struct printf_spec spec) { char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */ char *p = ip6_addr; @@ -612,16 +652,17 @@ static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width, for (i = 0; i < 8; i++) { p = pack_hex_byte(p, addr[2 * i]); p = pack_hex_byte(p, addr[2 * i + 1]); - if (!(flags & SPECIAL) && i != 7) + if (!(spec.flags & SPECIAL) && i != 7) *p++ = ':'; } *p = '\0'; + spec.flags &= ~SPECIAL; - return string(buf, end, ip6_addr, field_width, precision, flags & ~SPECIAL); + return string(buf, end, ip6_addr, spec); } -static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width, - int precision, int flags) +static char *ip4_addr_string(char *buf, char *end, u8 *addr, + struct printf_spec spec) { char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */ char temp[3]; /* hold each IP quad in reverse order */ @@ -637,8 +678,9 @@ static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width, *p++ = '.'; } *p = '\0'; + spec.flags &= ~SPECIAL; - return string(buf, end, ip4_addr, field_width, precision, flags & ~SPECIAL); + return string(buf, end, ip4_addr, spec); } /* @@ -663,41 +705,233 @@ static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width, * function pointers are really function descriptors, which contain a * pointer to the real address. */ -static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field_width, int precision, int flags) +static char *pointer(const char *fmt, char *buf, char *end, void *ptr, + struct printf_spec spec) { if (!ptr) - return string(buf, end, "(null)", field_width, precision, flags); + return string(buf, end, "(null)", spec); switch (*fmt) { case 'F': ptr = dereference_function_descriptor(ptr); /* Fallthrough */ case 'S': - return symbol_string(buf, end, ptr, field_width, precision, flags); + return symbol_string(buf, end, ptr, spec); case 'R': - return resource_string(buf, end, ptr, field_width, precision, flags); + return resource_string(buf, end, ptr, spec); case 'm': - flags |= SPECIAL; + spec.flags |= SPECIAL; /* Fallthrough */ case 'M': - return mac_address_string(buf, end, ptr, field_width, precision, flags); + return mac_address_string(buf, end, ptr, spec); case 'i': - flags |= SPECIAL; + spec.flags |= SPECIAL; /* Fallthrough */ case 'I': if (fmt[1] == '6') - return ip6_addr_string(buf, end, ptr, field_width, precision, flags); + return ip6_addr_string(buf, end, ptr, spec); if (fmt[1] == '4') - return ip4_addr_string(buf, end, ptr, field_width, precision, flags); - flags &= ~SPECIAL; + return ip4_addr_string(buf, end, ptr, spec); + spec.flags &= ~SPECIAL; + break; + } + spec.flags |= SMALL; + if (spec.field_width == -1) { + spec.field_width = 2*sizeof(void *); + spec.flags |= ZEROPAD; + } + spec.base = 16; + + return number(buf, end, (unsigned long) ptr, spec); +} + +/* + * Helper function to decode printf style format. + * Each call decode a token from the format and return the + * number of characters read (or likely the delta where it wants + * to go on the next call). + * The decoded token is returned through the parameters + * + * 'h', 'l', or 'L' for integer fields + * 'z' support added 23/7/1999 S.H. + * 'z' changed to 'Z' --davidm 1/25/99 + * 't' added for ptrdiff_t + * + * @fmt: the format string + * @type of the token returned + * @flags: various flags such as +, -, # tokens.. + * @field_width: overwritten width + * @base: base of the number (octal, hex, ...) + * @precision: precision of a number + * @qualifier: qualifier of a number (long, size_t, ...) + */ +static int format_decode(const char *fmt, struct printf_spec *spec) +{ + const char *start = fmt; + + /* we finished early by reading the field width */ + if (spec->type == FORMAT_TYPE_WIDTH) { + if (spec->field_width < 0) { + spec->field_width = -spec->field_width; + spec->flags |= LEFT; + } + spec->type = FORMAT_TYPE_NONE; + goto precision; + } + + /* we finished early by reading the precision */ + if (spec->type == FORMAT_TYPE_PRECISION) { + if (spec->precision < 0) + spec->precision = 0; + + spec->type = FORMAT_TYPE_NONE; + goto qualifier; + } + + /* By default */ + spec->type = FORMAT_TYPE_NONE; + + for (; *fmt ; ++fmt) { + if (*fmt == '%') + break; + } + + /* Return the current non-format string */ + if (fmt != start || !*fmt) + return fmt - start; + + /* Process flags */ + spec->flags = 0; + + while (1) { /* this also skips first '%' */ + bool found = true; + + ++fmt; + + switch (*fmt) { + case '-': spec->flags |= LEFT; break; + case '+': spec->flags |= PLUS; break; + case ' ': spec->flags |= SPACE; break; + case '#': spec->flags |= SPECIAL; break; + case '0': spec->flags |= ZEROPAD; break; + default: found = false; + } + + if (!found) + break; + } + + /* get field width */ + spec->field_width = -1; + + if (isdigit(*fmt)) + spec->field_width = skip_atoi(&fmt); + else if (*fmt == '*') { + /* it's the next argument */ + spec->type = FORMAT_TYPE_WIDTH; + return ++fmt - start; + } + +precision: + /* get the precision */ + spec->precision = -1; + if (*fmt == '.') { + ++fmt; + if (isdigit(*fmt)) { + spec->precision = skip_atoi(&fmt); + if (spec->precision < 0) + spec->precision = 0; + } else if (*fmt == '*') { + /* it's the next argument */ + spec->type = FORMAT_TYPE_PRECISION; + return ++fmt - start; + } + } + +qualifier: + /* get the conversion qualifier */ + spec->qualifier = -1; + if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || + *fmt == 'Z' || *fmt == 'z' || *fmt == 't') { + spec->qualifier = *fmt; + ++fmt; + if (spec->qualifier == 'l' && *fmt == 'l') { + spec->qualifier = 'L'; + ++fmt; + } + } + + /* default base */ + spec->base = 10; + switch (*fmt) { + case 'c': + spec->type = FORMAT_TYPE_CHAR; + return ++fmt - start; + + case 's': + spec->type = FORMAT_TYPE_STR; + return ++fmt - start; + + case 'p': + spec->type = FORMAT_TYPE_PTR; + return fmt - start; + /* skip alnum */ + + case 'n': + spec->type = FORMAT_TYPE_NRCHARS; + return ++fmt - start; + + case '%': + spec->type = FORMAT_TYPE_PERCENT_CHAR; + return ++fmt - start; + + /* integer number formats - set up the flags and "break" */ + case 'o': + spec->base = 8; break; + + case 'x': + spec->flags |= SMALL; + + case 'X': + spec->base = 16; + break; + + case 'd': + case 'i': + spec->flags |= SIGN; + case 'u': + break; + + default: + spec->type = FORMAT_TYPE_INVALID; + return fmt - start; } - flags |= SMALL; - if (field_width == -1) { - field_width = 2*sizeof(void *); - flags |= ZEROPAD; + + if (spec->qualifier == 'L') + spec->type = FORMAT_TYPE_LONG_LONG; + else if (spec->qualifier == 'l') { + if (spec->flags & SIGN) + spec->type = FORMAT_TYPE_LONG; + else + spec->type = FORMAT_TYPE_ULONG; + } else if (spec->qualifier == 'Z' || spec->qualifier == 'z') { + spec->type = FORMAT_TYPE_SIZE_T; + } else if (spec->qualifier == 't') { + spec->type = FORMAT_TYPE_PTRDIFF; + } else if (spec->qualifier == 'h') { + if (spec->flags & SIGN) + spec->type = FORMAT_TYPE_SHORT; + else + spec->type = FORMAT_TYPE_USHORT; + } else { + if (spec->flags & SIGN) + spec->type = FORMAT_TYPE_INT; + else + spec->type = FORMAT_TYPE_UINT; } - return number(buf, end, (unsigned long) ptr, 16, field_width, precision, flags); + + return ++fmt - start; } /** @@ -726,18 +960,9 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) { unsigned long long num; - int base; char *str, *end, c; - - int flags; /* flags to number() */ - - int field_width; /* width of output field */ - int precision; /* min. # of digits for integers; max - number of chars for from string */ - int qualifier; /* 'h', 'l', or 'L' for integer fields */ - /* 'z' support added 23/7/1999 S.H. */ - /* 'z' changed to 'Z' --davidm 1/25/99 */ - /* 't' added for ptrdiff_t */ + int read; + struct printf_spec spec = {0}; /* Reject out-of-range values early. Large positive sizes are used for unknown buffer sizes. */ @@ -758,184 +983,144 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) size = end - buf; } - for (; *fmt ; ++fmt) { - if (*fmt != '%') { - if (str < end) - *str = *fmt; - ++str; - continue; - } + while (*fmt) { + const char *old_fmt = fmt; - /* process flags */ - flags = 0; - repeat: - ++fmt; /* this also skips first '%' */ - switch (*fmt) { - case '-': flags |= LEFT; goto repeat; - case '+': flags |= PLUS; goto repeat; - case ' ': flags |= SPACE; goto repeat; - case '#': flags |= SPECIAL; goto repeat; - case '0': flags |= ZEROPAD; goto repeat; - } + read = format_decode(fmt, &spec); - /* get field width */ - field_width = -1; - if (isdigit(*fmt)) - field_width = skip_atoi(&fmt); - else if (*fmt == '*') { - ++fmt; - /* it's the next argument */ - field_width = va_arg(args, int); - if (field_width < 0) { - field_width = -field_width; - flags |= LEFT; - } - } + fmt += read; - /* get the precision */ - precision = -1; - if (*fmt == '.') { - ++fmt; - if (isdigit(*fmt)) - precision = skip_atoi(&fmt); - else if (*fmt == '*') { - ++fmt; - /* it's the next argument */ - precision = va_arg(args, int); + switch (spec.type) { + case FORMAT_TYPE_NONE: { + int copy = read; + if (str < end) { + if (copy > end - str) + copy = end - str; + memcpy(str, old_fmt, copy); } - if (precision < 0) - precision = 0; + str += read; + break; } - /* get the conversion qualifier */ - qualifier = -1; - if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || - *fmt =='Z' || *fmt == 'z' || *fmt == 't') { - qualifier = *fmt; - ++fmt; - if (qualifier == 'l' && *fmt == 'l') { - qualifier = 'L'; - ++fmt; - } - } + case FORMAT_TYPE_WIDTH: + spec.field_width = va_arg(args, int); + break; - /* default base */ - base = 10; + case FORMAT_TYPE_PRECISION: + spec.precision = va_arg(args, int); + break; - switch (*fmt) { - case 'c': - if (!(flags & LEFT)) { - while (--field_width > 0) { - if (str < end) - *str = ' '; - ++str; - } - } - c = (unsigned char) va_arg(args, int); - if (str < end) - *str = c; - ++str; - while (--field_width > 0) { + case FORMAT_TYPE_CHAR: + if (!(spec.flags & LEFT)) { + while (--spec.field_width > 0) { if (str < end) *str = ' '; ++str; - } - continue; - - case 's': - str = string(str, end, va_arg(args, char *), field_width, precision, flags); - continue; - - case 'p': - str = pointer(fmt+1, str, end, - va_arg(args, void *), - field_width, precision, flags); - /* Skip all alphanumeric pointer suffixes */ - while (isalnum(fmt[1])) - fmt++; - continue; - - case 'n': - /* FIXME: - * What does C99 say about the overflow case here? */ - if (qualifier == 'l') { - long * ip = va_arg(args, long *); - *ip = (str - buf); - } else if (qualifier == 'Z' || qualifier == 'z') { - size_t * ip = va_arg(args, size_t *); - *ip = (str - buf); - } else { - int * ip = va_arg(args, int *); - *ip = (str - buf); - } - continue; - case '%': + } + } + c = (unsigned char) va_arg(args, int); + if (str < end) + *str = c; + ++str; + while (--spec.field_width > 0) { if (str < end) - *str = '%'; + *str = ' '; ++str; - continue; + } + break; - /* integer number formats - set up the flags and "break" */ - case 'o': - base = 8; - break; + case FORMAT_TYPE_STR: + str = string(str, end, va_arg(args, char *), spec); + break; - case 'x': - flags |= SMALL; - case 'X': - base = 16; - break; + case FORMAT_TYPE_PTR: + str = pointer(fmt+1, str, end, va_arg(args, void *), + spec); + while (isalnum(*fmt)) + fmt++; + break; - case 'd': - case 'i': - flags |= SIGN; - case 'u': - break; + case FORMAT_TYPE_PERCENT_CHAR: + if (str < end) + *str = '%'; + ++str; + break; - default: + case FORMAT_TYPE_INVALID: + if (str < end) + *str = '%'; + ++str; + if (*fmt) { if (str < end) - *str = '%'; + *str = *fmt; ++str; - if (*fmt) { - if (str < end) - *str = *fmt; - ++str; - } else { - --fmt; - } - continue; + } else { + --fmt; + } + break; + + case FORMAT_TYPE_NRCHARS: { + int qualifier = spec.qualifier; + + if (qualifier == 'l') { + long *ip = va_arg(args, long *); + *ip = (str - buf); + } else if (qualifier == 'Z' || + qualifier == 'z') { + size_t *ip = va_arg(args, size_t *); + *ip = (str - buf); + } else { + int *ip = va_arg(args, int *); + *ip = (str - buf); + } + break; } - if (qualifier == 'L') - num = va_arg(args, long long); - else if (qualifier == 'l') { - num = va_arg(args, unsigned long); - if (flags & SIGN) - num = (signed long) num; - } else if (qualifier == 'Z' || qualifier == 'z') { - num = va_arg(args, size_t); - } else if (qualifier == 't') { - num = va_arg(args, ptrdiff_t); - } else if (qualifier == 'h') { - num = (unsigned short) va_arg(args, int); - if (flags & SIGN) - num = (signed short) num; - } else { - num = va_arg(args, unsigned int); - if (flags & SIGN) - num = (signed int) num; + + default: + switch (spec.type) { + case FORMAT_TYPE_LONG_LONG: + num = va_arg(args, long long); + break; + case FORMAT_TYPE_ULONG: + num = va_arg(args, unsigned long); + break; + case FORMAT_TYPE_LONG: + num = va_arg(args, long); + break; + case FORMAT_TYPE_SIZE_T: + num = va_arg(args, size_t); + break; + case FORMAT_TYPE_PTRDIFF: + num = va_arg(args, ptrdiff_t); + break; + case FORMAT_TYPE_USHORT: + num = (unsigned short) va_arg(args, int); + break; + case FORMAT_TYPE_SHORT: + num = (short) va_arg(args, int); + break; + case FORMAT_TYPE_INT: + num = (int) va_arg(args, int); + break; + default: + num = va_arg(args, unsigned int); + } + + str = number(str, end, num, spec); } - str = number(str, end, num, base, - field_width, precision, flags); } + if (size > 0) { if (str < end) *str = '\0'; else end[-1] = '\0'; } + /* the trailing null byte doesn't count towards the total */ return str-buf; + } EXPORT_SYMBOL(vsnprintf); @@ -1058,6 +1243,372 @@ int sprintf(char * buf, const char *fmt, ...) } EXPORT_SYMBOL(sprintf); +#ifdef CONFIG_BINARY_PRINTF +/* + * bprintf service: + * vbin_printf() - VA arguments to binary data + * bstr_printf() - Binary data to text string + */ + +/** + * vbin_printf - Parse a format string and place args' binary value in a buffer + * @bin_buf: The buffer to place args' binary value + * @size: The size of the buffer(by words(32bits), not characters) + * @fmt: The format string to use + * @args: Arguments for the format string + * + * The format follows C99 vsnprintf, except %n is ignored, and its argument + * is skiped. + * + * The return value is the number of words(32bits) which would be generated for + * the given input. + * + * NOTE: + * If the return value is greater than @size, the resulting bin_buf is NOT + * valid for bstr_printf(). + */ +int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) +{ + struct printf_spec spec = {0}; + char *str, *end; + int read; + + str = (char *)bin_buf; + end = (char *)(bin_buf + size); + +#define save_arg(type) \ +do { \ + if (sizeof(type) == 8) { \ + unsigned long long value; \ + str = PTR_ALIGN(str, sizeof(u32)); \ + value = va_arg(args, unsigned long long); \ + if (str + sizeof(type) <= end) { \ + *(u32 *)str = *(u32 *)&value; \ + *(u32 *)(str + 4) = *((u32 *)&value + 1); \ + } \ + } else { \ + unsigned long value; \ + str = PTR_ALIGN(str, sizeof(type)); \ + value = va_arg(args, int); \ + if (str + sizeof(type) <= end) \ + *(typeof(type) *)str = (type)value; \ + } \ + str += sizeof(type); \ +} while (0) + + + while (*fmt) { + read = format_decode(fmt, &spec); + + fmt += read; + + switch (spec.type) { + case FORMAT_TYPE_NONE: + break; + + case FORMAT_TYPE_WIDTH: + case FORMAT_TYPE_PRECISION: + save_arg(int); + break; + + case FORMAT_TYPE_CHAR: + save_arg(char); + break; + + case FORMAT_TYPE_STR: { + const char *save_str = va_arg(args, char *); + size_t len; + if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE + || (unsigned long)save_str < PAGE_SIZE) + save_str = "<NULL>"; + len = strlen(save_str); + if (str + len + 1 < end) + memcpy(str, save_str, len + 1); + str += len + 1; + break; + } + + case FORMAT_TYPE_PTR: + save_arg(void *); + /* skip all alphanumeric pointer suffixes */ + while (isalnum(*fmt)) + fmt++; + break; + + case FORMAT_TYPE_PERCENT_CHAR: + break; + + case FORMAT_TYPE_INVALID: + if (!*fmt) + --fmt; + break; + + case FORMAT_TYPE_NRCHARS: { + /* skip %n 's argument */ + int qualifier = spec.qualifier; + void *skip_arg; + if (qualifier == 'l') + skip_arg = va_arg(args, long *); + else if (qualifier == 'Z' || qualifier == 'z') + skip_arg = va_arg(args, size_t *); + else + skip_arg = va_arg(args, int *); + break; + } + + default: + switch (spec.type) { + + case FORMAT_TYPE_LONG_LONG: + save_arg(long long); + break; + case FORMAT_TYPE_ULONG: + case FORMAT_TYPE_LONG: + save_arg(unsigned long); + break; + case FORMAT_TYPE_SIZE_T: + save_arg(size_t); + break; + case FORMAT_TYPE_PTRDIFF: + save_arg(ptrdiff_t); + break; + case FORMAT_TYPE_USHORT: + case FORMAT_TYPE_SHORT: + save_arg(short); + break; + default: + save_arg(int); + } + } + } + return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; + +#undef save_arg +} +EXPORT_SYMBOL_GPL(vbin_printf); + +/** + * bstr_printf - Format a string from binary arguments and place it in a buffer + * @buf: The buffer to place the result into + * @size: The size of the buffer, including the trailing null space + * @fmt: The format string to use + * @bin_buf: Binary arguments for the format string + * + * This function like C99 vsnprintf, but the difference is that vsnprintf gets + * arguments from stack, and bstr_printf gets arguments from @bin_buf which is + * a binary buffer that generated by vbin_printf. + * + * The format follows C99 vsnprintf, but has some extensions: + * %pS output the name of a text symbol + * %pF output the name of a function pointer + * %pR output the address range in a struct resource + * %n is ignored + * + * The return value is the number of characters which would + * be generated for the given input, excluding the trailing + * '\0', as per ISO C99. If you want to have the exact + * number of characters written into @buf as return value + * (not including the trailing '\0'), use vscnprintf(). If the + * return is greater than or equal to @size, the resulting + * string is truncated. + */ +int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) +{ + unsigned long long num; + char *str, *end, c; + const char *args = (const char *)bin_buf; + + struct printf_spec spec = {0}; + + if (unlikely((int) size < 0)) { + /* There can be only one.. */ + static char warn = 1; + WARN_ON(warn); + warn = 0; + return 0; + } + + str = buf; + end = buf + size; + +#define get_arg(type) \ +({ \ + typeof(type) value; \ + if (sizeof(type) == 8) { \ + args = PTR_ALIGN(args, sizeof(u32)); \ + *(u32 *)&value = *(u32 *)args; \ + *((u32 *)&value + 1) = *(u32 *)(args + 4); \ + } else { \ + args = PTR_ALIGN(args, sizeof(type)); \ + value = *(typeof(type) *)args; \ + } \ + args += sizeof(type); \ + value; \ +}) + + /* Make sure end is always >= buf */ + if (end < buf) { + end = ((void *)-1); + size = end - buf; + } + + while (*fmt) { + int read; + const char *old_fmt = fmt; + + read = format_decode(fmt, &spec); + + fmt += read; + + switch (spec.type) { + case FORMAT_TYPE_NONE: { + int copy = read; + if (str < end) { + if (copy > end - str) + copy = end - str; + memcpy(str, old_fmt, copy); + } + str += read; + break; + } + + case FORMAT_TYPE_WIDTH: + spec.field_width = get_arg(int); + break; + + case FORMAT_TYPE_PRECISION: + spec.precision = get_arg(int); + break; + + case FORMAT_TYPE_CHAR: + if (!(spec.flags & LEFT)) { + while (--spec.field_width > 0) { + if (str < end) + *str = ' '; + ++str; + } + } + c = (unsigned char) get_arg(char); + if (str < end) + *str = c; + ++str; + while (--spec.field_width > 0) { + if (str < end) + *str = ' '; + ++str; + } + break; + + case FORMAT_TYPE_STR: { + const char *str_arg = args; + size_t len = strlen(str_arg); + args += len + 1; + str = string(str, end, (char *)str_arg, spec); + break; + } + + case FORMAT_TYPE_PTR: + str = pointer(fmt+1, str, end, get_arg(void *), spec); + while (isalnum(*fmt)) + fmt++; + break; + + case FORMAT_TYPE_PERCENT_CHAR: + if (str < end) + *str = '%'; + ++str; + break; + + case FORMAT_TYPE_INVALID: + if (str < end) + *str = '%'; + ++str; + if (*fmt) { + if (str < end) + *str = *fmt; + ++str; + } else { + --fmt; + } + break; + + case FORMAT_TYPE_NRCHARS: + /* skip */ + break; + + default: + switch (spec.type) { + + case FORMAT_TYPE_LONG_LONG: + num = get_arg(long long); + break; + case FORMAT_TYPE_ULONG: + num = get_arg(unsigned long); + break; + case FORMAT_TYPE_LONG: + num = get_arg(unsigned long); + break; + case FORMAT_TYPE_SIZE_T: + num = get_arg(size_t); + break; + case FORMAT_TYPE_PTRDIFF: + num = get_arg(ptrdiff_t); + break; + case FORMAT_TYPE_USHORT: + num = get_arg(unsigned short); + break; + case FORMAT_TYPE_SHORT: + num = get_arg(short); + break; + case FORMAT_TYPE_UINT: + num = get_arg(unsigned int); + break; + default: + num = get_arg(int); + } + + str = number(str, end, num, spec); + } + } + + if (size > 0) { + if (str < end) + *str = '\0'; + else + end[-1] = '\0'; + } + +#undef get_arg + + /* the trailing null byte doesn't count towards the total */ + return str - buf; +} +EXPORT_SYMBOL_GPL(bstr_printf); + +/** + * bprintf - Parse a format string and place args' binary value in a buffer + * @bin_buf: The buffer to place args' binary value + * @size: The size of the buffer(by words(32bits), not characters) + * @fmt: The format string to use + * @...: Arguments for the format string + * + * The function returns the number of words(u32) written + * into @bin_buf. + */ +int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) +{ + va_list args; + int ret; + + va_start(args, fmt); + ret = vbin_printf(bin_buf, size, fmt, args); + va_end(args); + return ret; +} +EXPORT_SYMBOL_GPL(bprintf); + +#endif /* CONFIG_BINARY_PRINTF */ + /** * vsscanf - Unformat a buffer into a list of arguments * @buf: input buffer |