diff options
Diffstat (limited to 'lib/vsprintf.c')
| -rw-r--r-- | lib/vsprintf.c | 680 |
1 files changed, 506 insertions, 174 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index c3f36d415bd..6fe2c84eb05 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -23,12 +23,14 @@ #include <linux/ctype.h> #include <linux/kernel.h> #include <linux/kallsyms.h> +#include <linux/math64.h> #include <linux/uaccess.h> #include <linux/ioport.h> +#include <linux/dcache.h> +#include <linux/cred.h> #include <net/addrconf.h> #include <asm/page.h> /* for PAGE_SIZE */ -#include <asm/div64.h> #include <asm/sections.h> /* for dereference_function_descriptor() */ #include "kstrtox.h" @@ -38,6 +40,8 @@ * @cp: The start of the string * @endp: A pointer to the end of the parsed string will be placed here * @base: The number base to use + * + * This function is obsolete. Please use kstrtoull instead. */ unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) { @@ -61,6 +65,8 @@ EXPORT_SYMBOL(simple_strtoull); * @cp: The start of the string * @endp: A pointer to the end of the parsed string will be placed here * @base: The number base to use + * + * This function is obsolete. Please use kstrtoul instead. */ unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) { @@ -73,6 +79,8 @@ EXPORT_SYMBOL(simple_strtoul); * @cp: The start of the string * @endp: A pointer to the end of the parsed string will be placed here * @base: The number base to use + * + * This function is obsolete. Please use kstrtol instead. */ long simple_strtol(const char *cp, char **endp, unsigned int base) { @@ -88,6 +96,8 @@ EXPORT_SYMBOL(simple_strtol); * @cp: The start of the string * @endp: A pointer to the end of the parsed string will be placed here * @base: The number base to use + * + * This function is obsolete. Please use kstrtoll instead. */ long long simple_strtoll(const char *cp, char **endp, unsigned int base) { @@ -174,35 +184,25 @@ char *put_dec_trunc8(char *buf, unsigned r) unsigned q; /* Copy of previous function's body with added early returns */ - q = (r * (uint64_t)0x1999999a) >> 32; - *buf++ = (r - 10 * q) + '0'; /* 2 */ - if (q == 0) - return buf; - r = (q * (uint64_t)0x1999999a) >> 32; - *buf++ = (q - 10 * r) + '0'; /* 3 */ - if (r == 0) - return buf; - q = (r * (uint64_t)0x1999999a) >> 32; - *buf++ = (r - 10 * q) + '0'; /* 4 */ - if (q == 0) - return buf; - r = (q * (uint64_t)0x1999999a) >> 32; - *buf++ = (q - 10 * r) + '0'; /* 5 */ - if (r == 0) - return buf; - q = (r * 0x199a) >> 16; - *buf++ = (r - 10 * q) + '0'; /* 6 */ + while (r >= 10000) { + q = r + '0'; + r = (r * (uint64_t)0x1999999a) >> 32; + *buf++ = q - 10*r; + } + + q = (r * 0x199a) >> 16; /* r <= 9999 */ + *buf++ = (r - 10 * q) + '0'; if (q == 0) return buf; - r = (q * 0xcd) >> 11; - *buf++ = (q - 10 * r) + '0'; /* 7 */ + r = (q * 0xcd) >> 11; /* q <= 999 */ + *buf++ = (q - 10 * r) + '0'; if (r == 0) return buf; - q = (r * 0xcd) >> 11; - *buf++ = (r - 10 * q) + '0'; /* 8 */ + q = (r * 0xcd) >> 11; /* r <= 99 */ + *buf++ = (r - 10 * q) + '0'; if (q == 0) return buf; - *buf++ = q + '0'; /* 9 */ + *buf++ = q + '0'; /* q <= 9 */ return buf; } @@ -243,18 +243,34 @@ char *put_dec(char *buf, unsigned long long n) /* Second algorithm: valid only for 64-bit long longs */ +/* See comment in put_dec_full9 for choice of constants */ static noinline_for_stack -char *put_dec_full4(char *buf, unsigned q) +void put_dec_full4(char *buf, unsigned q) { unsigned r; - r = (q * 0xcccd) >> 19; - *buf++ = (q - 10 * r) + '0'; - q = (r * 0x199a) >> 16; - *buf++ = (r - 10 * q) + '0'; + r = (q * 0xccd) >> 15; + buf[0] = (q - 10 * r) + '0'; + q = (r * 0xcd) >> 11; + buf[1] = (r - 10 * q) + '0'; r = (q * 0xcd) >> 11; - *buf++ = (q - 10 * r) + '0'; - *buf++ = r + '0'; - return buf; + buf[2] = (q - 10 * r) + '0'; + buf[3] = r + '0'; +} + +/* + * Call put_dec_full4 on x % 10000, return x / 10000. + * The approximation x/10000 == (x * 0x346DC5D7) >> 43 + * holds for all x < 1,128,869,999. The largest value this + * helper will ever be asked to convert is 1,125,520,955. + * (d1 in the put_dec code, assuming n is all-ones). + */ +static +unsigned put_dec_helper4(char *buf, unsigned x) +{ + uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; + + put_dec_full4(buf, x - q * 10000); + return q; } /* Based on code by Douglas W. Jones found at @@ -276,28 +292,19 @@ char *put_dec(char *buf, unsigned long long n) d3 = (h >> 16); /* implicit "& 0xffff" */ q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); + q = put_dec_helper4(buf, q); - buf = put_dec_full4(buf, q % 10000); - q = q / 10000; - - d1 = q + 7671 * d3 + 9496 * d2 + 6 * d1; - buf = put_dec_full4(buf, d1 % 10000); - q = d1 / 10000; - - d2 = q + 4749 * d3 + 42 * d2; - buf = put_dec_full4(buf, d2 % 10000); - q = d2 / 10000; - - d3 = q + 281 * d3; - if (!d3) - goto done; - buf = put_dec_full4(buf, d3 % 10000); - q = d3 / 10000; - if (!q) - goto done; - buf = put_dec_full4(buf, q); - done: - while (buf[-1] == '0') + q += 7671 * d3 + 9496 * d2 + 6 * d1; + q = put_dec_helper4(buf+4, q); + + q += 4749 * d3 + 42 * d2; + q = put_dec_helper4(buf+8, q); + + q += 281 * d3; + buf += 12; + if (q) + buf = put_dec_trunc8(buf, q); + else while (buf[-1] == '0') --buf; return buf; @@ -357,7 +364,6 @@ enum format_type { FORMAT_TYPE_SHORT, FORMAT_TYPE_UINT, FORMAT_TYPE_INT, - FORMAT_TYPE_NRCHARS, FORMAT_TYPE_SIZE_T, FORMAT_TYPE_PTRDIFF }; @@ -527,16 +533,98 @@ char *string(char *buf, char *end, const char *s, struct printf_spec spec) return buf; } +static void widen(char *buf, char *end, unsigned len, unsigned spaces) +{ + size_t size; + if (buf >= end) /* nowhere to put anything */ + return; + size = end - buf; + if (size <= spaces) { + memset(buf, ' ', size); + return; + } + if (len) { + if (len > size - spaces) + len = size - spaces; + memmove(buf + spaces, buf, len); + } + memset(buf, ' ', spaces); +} + +static noinline_for_stack +char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, + const char *fmt) +{ + const char *array[4], *s; + const struct dentry *p; + int depth; + int i, n; + + switch (fmt[1]) { + case '2': case '3': case '4': + depth = fmt[1] - '0'; + break; + default: + depth = 1; + } + + rcu_read_lock(); + for (i = 0; i < depth; i++, d = p) { + p = ACCESS_ONCE(d->d_parent); + array[i] = ACCESS_ONCE(d->d_name.name); + if (p == d) { + if (i) + array[i] = ""; + i++; + break; + } + } + s = array[--i]; + for (n = 0; n != spec.precision; n++, buf++) { + char c = *s++; + if (!c) { + if (!i) + break; + c = '/'; + s = array[--i]; + } + if (buf < end) + *buf = c; + } + rcu_read_unlock(); + if (n < spec.field_width) { + /* we want to pad the sucker */ + unsigned spaces = spec.field_width - n; + if (!(spec.flags & LEFT)) { + widen(buf - n, end, n, spaces); + return buf + spaces; + } + while (spaces--) { + if (buf < end) + *buf = ' '; + ++buf; + } + } + return buf; +} + static noinline_for_stack char *symbol_string(char *buf, char *end, void *ptr, - struct printf_spec spec, char ext) + struct printf_spec spec, const char *fmt) { - unsigned long value = (unsigned long) ptr; + unsigned long value; #ifdef CONFIG_KALLSYMS char sym[KSYM_SYMBOL_LEN]; - if (ext == 'B') +#endif + + if (fmt[1] == 'R') + ptr = __builtin_extract_return_addr(ptr); + value = (unsigned long)ptr; + +#ifdef CONFIG_KALLSYMS + if (*fmt == 'B') sprint_backtrace(sym, value); - else if (ext != 'f' && ext != 's') + else if (*fmt != 'f' && *fmt != 's') sprint_symbol(sym, value); else sprint_symbol_no_offset(sym, value); @@ -630,10 +718,15 @@ char *resource_string(char *buf, char *end, struct resource *res, specp = &mem_spec; decode = 0; } - p = number(p, pend, res->start, *specp); - if (res->start != res->end) { - *p++ = '-'; - p = number(p, pend, res->end, *specp); + if (decode && res->flags & IORESOURCE_UNSET) { + p = string(p, pend, "size ", str_spec); + p = number(p, pend, resource_size(res), *specp); + } else { + p = number(p, pend, res->start, *specp); + if (res->start != res->end) { + *p++ = '-'; + p = number(p, pend, res->end, *specp); + } } if (decode) { if (res->flags & IORESOURCE_MEM_64) @@ -655,6 +748,50 @@ char *resource_string(char *buf, char *end, struct resource *res, } static noinline_for_stack +char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, + const char *fmt) +{ + int i, len = 1; /* if we pass '%ph[CDN]', field width remains + negative value, fallback to the default */ + char separator; + + if (spec.field_width == 0) + /* nothing to print */ + return buf; + + if (ZERO_OR_NULL_PTR(addr)) + /* NULL pointer */ + return string(buf, end, NULL, spec); + + switch (fmt[1]) { + case 'C': + separator = ':'; + break; + case 'D': + separator = '-'; + break; + case 'N': + separator = 0; + break; + default: + separator = ' '; + break; + } + + if (spec.field_width > 0) + len = min_t(int, spec.field_width, 64); + + for (i = 0; i < len && buf < end - 1; i++) { + buf = hex_byte_pack(buf, addr[i]); + + if (buf < end && separator && i != len - 1) + *buf++ = separator; + } + + return buf; +} + +static noinline_for_stack char *mac_address_string(char *buf, char *end, u8 *addr, struct printf_spec spec, const char *fmt) { @@ -662,15 +799,28 @@ char *mac_address_string(char *buf, char *end, u8 *addr, char *p = mac_addr; int i; char separator; + bool reversed = false; - if (fmt[1] == 'F') { /* FDDI canonical format */ + switch (fmt[1]) { + case 'F': separator = '-'; - } else { + break; + + case 'R': + reversed = true; + /* fall through */ + + default: separator = ':'; + break; } for (i = 0; i < 6; i++) { - p = hex_byte_pack(p, addr[i]); + if (reversed) + p = hex_byte_pack(p, addr[5 - i]); + else + p = hex_byte_pack(p, addr[i]); + if (fmt[0] == 'M' && i != 5) *p++ = separator; } @@ -854,6 +1004,103 @@ char *ip4_addr_string(char *buf, char *end, const u8 *addr, } static noinline_for_stack +char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, + struct printf_spec spec, const char *fmt) +{ + bool have_p = false, have_s = false, have_f = false, have_c = false; + char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + + sizeof(":12345") + sizeof("/123456789") + + sizeof("%1234567890")]; + char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); + const u8 *addr = (const u8 *) &sa->sin6_addr; + char fmt6[2] = { fmt[0], '6' }; + u8 off = 0; + + fmt++; + while (isalpha(*++fmt)) { + switch (*fmt) { + case 'p': + have_p = true; + break; + case 'f': + have_f = true; + break; + case 's': + have_s = true; + break; + case 'c': + have_c = true; + break; + } + } + + if (have_p || have_s || have_f) { + *p = '['; + off = 1; + } + + if (fmt6[0] == 'I' && have_c) + p = ip6_compressed_string(ip6_addr + off, addr); + else + p = ip6_string(ip6_addr + off, addr, fmt6); + + if (have_p || have_s || have_f) + *p++ = ']'; + + if (have_p) { + *p++ = ':'; + p = number(p, pend, ntohs(sa->sin6_port), spec); + } + if (have_f) { + *p++ = '/'; + p = number(p, pend, ntohl(sa->sin6_flowinfo & + IPV6_FLOWINFO_MASK), spec); + } + if (have_s) { + *p++ = '%'; + p = number(p, pend, sa->sin6_scope_id, spec); + } + *p = '\0'; + + return string(buf, end, ip6_addr, spec); +} + +static noinline_for_stack +char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, + struct printf_spec spec, const char *fmt) +{ + bool have_p = false; + char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; + char *pend = ip4_addr + sizeof(ip4_addr); + const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; + char fmt4[3] = { fmt[0], '4', 0 }; + + fmt++; + while (isalpha(*++fmt)) { + switch (*fmt) { + case 'p': + have_p = true; + break; + case 'h': + case 'l': + case 'n': + case 'b': + fmt4[2] = *fmt; + break; + } + } + + p = ip4_string(ip4_addr, addr, fmt4); + if (have_p) { + *p++ = ':'; + p = number(p, pend, ntohs(sa->sin_port), spec); + } + *p = '\0'; + + return string(buf, end, ip4_addr, spec); +} + +static noinline_for_stack char *uuid_string(char *buf, char *end, const u8 *addr, struct printf_spec spec, const char *fmt) { @@ -912,6 +1159,30 @@ char *netdev_feature_string(char *buf, char *end, const u8 *addr, return number(buf, end, *(const netdev_features_t *)addr, spec); } +static noinline_for_stack +char *address_val(char *buf, char *end, const void *addr, + struct printf_spec spec, const char *fmt) +{ + unsigned long long num; + + spec.flags |= SPECIAL | SMALL | ZEROPAD; + spec.base = 16; + + switch (fmt[1]) { + case 'd': + num = *(const dma_addr_t *)addr; + spec.field_width = sizeof(dma_addr_t) * 2 + 2; + break; + case 'p': + default: + num = *(const phys_addr_t *)addr; + spec.field_width = sizeof(phys_addr_t) * 2 + 2; + break; + } + + return number(buf, end, num, spec); +} + int kptr_restrict __read_mostly; /* @@ -925,6 +1196,7 @@ int kptr_restrict __read_mostly; * - 'f' For simple symbolic function names without offset * - 'S' For symbolic direct pointers with offset * - 's' For symbolic direct pointers without offset + * - '[FfSs]R' as above with __builtin_extract_return_addr() translation * - 'B' For backtraced symbolic direct pointers with offset * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] @@ -933,14 +1205,21 @@ int kptr_restrict __read_mostly; * - 'm' For a 6-byte MAC address, it prints the hex address without colons * - 'MF' For a 6-byte MAC FDDI address, it prints the address * with a dash-separated hex notation + * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) * IPv6 uses colon separated network-order 16 bit hex with leading 0's + * [S][pfs] + * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to + * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] * - 'i' [46] for 'raw' IPv4/IPv6 addresses * IPv6 omits the colons (01020304...0f) * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) - * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order - * - 'I6c' for IPv6 addresses printed as specified by + * [S][pfs] + * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to + * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] + * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order + * - 'I[6S]c' for IPv6 addresses printed as specified by * http://tools.ietf.org/html/rfc5952 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" @@ -960,6 +1239,17 @@ int kptr_restrict __read_mostly; * correctness of the format string and va_list arguments. * - 'K' For a kernel pointer that should be hidden from unprivileged users * - 'NF' For a netdev_features_t + * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with + * a certain separator (' ' by default): + * C colon + * D dash + * N no separator + * The maximum supported length is 64 bytes of the input. Consider + * to use print_hex_dump() for the larger input. + * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives + * (default assumed to be phys_addr_t, passed by reference) + * - 'd[234]' For a dentry name (optionally 2-4 last components) + * - 'D[234]' Same as 'd' but for a struct file * * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 * function pointers are really function descriptors, which contain a @@ -989,13 +1279,16 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr, case 'S': case 's': case 'B': - return symbol_string(buf, end, ptr, spec, *fmt); + return symbol_string(buf, end, ptr, spec, fmt); case 'R': case 'r': return resource_string(buf, end, ptr, spec, fmt); + case 'h': + return hex_string(buf, end, ptr, spec, fmt); case 'M': /* Colon separated: 00:01:02:03:04:05 */ case 'm': /* Contiguous: 000102030405 */ - /* [mM]F (FDDI, bit reversed) */ + /* [mM]F (FDDI) */ + /* [mM]R (Reverse order; Bluetooth) */ return mac_address_string(buf, end, ptr, spec, fmt); case 'I': /* Formatted IP supported * 4: 1.2.3.4 @@ -1011,6 +1304,21 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr, return ip6_addr_string(buf, end, ptr, spec, fmt); case '4': return ip4_addr_string(buf, end, ptr, spec, fmt); + case 'S': { + const union { + struct sockaddr raw; + struct sockaddr_in v4; + struct sockaddr_in6 v6; + } *sa = ptr; + + switch (sa->raw.sa_family) { + case AF_INET: + return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); + case AF_INET6: + return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); + default: + return string(buf, end, "(invalid address)", spec); + }} } break; case 'U': @@ -1030,22 +1338,57 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr, * %pK cannot be used in IRQ context because its test * for CAP_SYSLOG would be meaningless. */ - if (in_irq() || in_serving_softirq() || in_nmi()) { + if (kptr_restrict && (in_irq() || in_serving_softirq() || + in_nmi())) { if (spec.field_width == -1) spec.field_width = default_width; return string(buf, end, "pK-error", spec); } - if (!((kptr_restrict == 0) || - (kptr_restrict == 1 && - has_capability_noaudit(current, CAP_SYSLOG)))) + + switch (kptr_restrict) { + case 0: + /* Always print %pK values */ + break; + case 1: { + /* + * Only print the real pointer value if the current + * process has CAP_SYSLOG and is running with the + * same credentials it started with. This is because + * access to files is checked at open() time, but %pK + * checks permission at read() time. We don't want to + * leak pointer values if a binary opens a file using + * %pK and then elevates privileges before reading it. + */ + const struct cred *cred = current_cred(); + + if (!has_capability_noaudit(current, CAP_SYSLOG) || + !uid_eq(cred->euid, cred->uid) || + !gid_eq(cred->egid, cred->gid)) + ptr = NULL; + break; + } + case 2: + default: + /* Always print 0's for %pK */ ptr = NULL; + break; + } break; + case 'N': switch (fmt[1]) { case 'F': return netdev_feature_string(buf, end, ptr, spec); } break; + case 'a': + return address_val(buf, end, ptr, spec, fmt); + case 'd': + return dentry_name(buf, end, ptr, spec, fmt); + case 'D': + return dentry_name(buf, end, + ((const struct file *)ptr)->f_path.dentry, + spec, fmt); } spec.flags |= SMALL; if (spec.field_width == -1) { @@ -1194,10 +1537,6 @@ qualifier: 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; @@ -1220,6 +1559,15 @@ qualifier: case 'u': break; + case 'n': + /* + * Since %n poses a greater security risk than utility, treat + * it as an invalid format specifier. Warn about its use so + * that new instances don't get added. + */ + WARN_ONCE(1, "Please remove ignored %%n in '%s'\n", fmt); + /* Fall-through */ + default: spec->type = FORMAT_TYPE_INVALID; return fmt - start; @@ -1272,16 +1620,25 @@ qualifier: * %pR output the address range in a struct resource with decoded flags * %pr output the address range in a struct resource with raw flags * %pM output a 6-byte MAC address with colons + * %pMR output a 6-byte MAC address with colons in reversed order + * %pMF output a 6-byte MAC address with dashes * %pm output a 6-byte MAC address without colons + * %pmR output a 6-byte MAC address without colons in reversed order * %pI4 print an IPv4 address without leading zeros * %pi4 print an IPv4 address with leading zeros * %pI6 print an IPv6 address with colons * %pi6 print an IPv6 address without colons * %pI6c print an IPv6 address as specified by RFC 5952 + * %pIS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address + * %piS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper * case. + * %*ph[CDN] a variable-length hex string with a separator (supports up to 64 + * bytes of the input) * %n is ignored * + * ** Please update Documentation/printk-formats.txt when making changes ** + * * 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 @@ -1384,22 +1741,6 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) ++str; break; - case FORMAT_TYPE_NRCHARS: { - u8 qualifier = spec.qualifier; - - if (qualifier == 'l') { - long *ip = va_arg(args, long *); - *ip = (str - buf); - } else if (_tolower(qualifier) == 'z') { - size_t *ip = va_arg(args, size_t *); - *ip = (str - buf); - } else { - int *ip = va_arg(args, int *); - *ip = (str - buf); - } - break; - } - default: switch (spec.type) { case FORMAT_TYPE_LONG_LONG: @@ -1412,7 +1753,10 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) num = va_arg(args, long); break; case FORMAT_TYPE_SIZE_T: - num = va_arg(args, size_t); + if (spec.flags & SIGN) + num = va_arg(args, ssize_t); + else + num = va_arg(args, size_t); break; case FORMAT_TYPE_PTRDIFF: num = va_arg(args, ptrdiff_t); @@ -1671,19 +2015,6 @@ do { \ fmt++; break; - case FORMAT_TYPE_NRCHARS: { - /* skip %n 's argument */ - u8 qualifier = spec.qualifier; - void *skip_arg; - if (qualifier == 'l') - skip_arg = va_arg(args, long *); - else if (_tolower(qualifier) == 'z') - skip_arg = va_arg(args, size_t *); - else - skip_arg = va_arg(args, int *); - break; - } - default: switch (spec.type) { @@ -1842,10 +2173,6 @@ int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) ++str; break; - case FORMAT_TYPE_NRCHARS: - /* skip */ - break; - default: { unsigned long long num; @@ -1940,11 +2267,15 @@ int vsscanf(const char *buf, const char *fmt, va_list args) char digit; int num = 0; u8 qualifier; - u8 base; + unsigned int base; + union { + long long s; + unsigned long long u; + } val; s16 field_width; bool is_sign; - while (*fmt && *str) { + while (*fmt) { /* skip any white space in format */ /* white space in format matchs any amount of * white space, including none, in the input. @@ -1969,6 +2300,8 @@ int vsscanf(const char *buf, const char *fmt, va_list args) * advance both strings to next white space */ if (*fmt == '*') { + if (!*str) + break; while (!isspace(*fmt) && *fmt != '%' && *fmt) fmt++; while (!isspace(*str) && *str) @@ -1978,8 +2311,11 @@ int vsscanf(const char *buf, const char *fmt, va_list args) /* get field width */ field_width = -1; - if (isdigit(*fmt)) + if (isdigit(*fmt)) { field_width = skip_atoi(&fmt); + if (field_width <= 0) + break; + } /* get conversion qualifier */ qualifier = -1; @@ -1997,11 +2333,21 @@ int vsscanf(const char *buf, const char *fmt, va_list args) } } - if (!*fmt || !*str) + if (!*fmt) + break; + + if (*fmt == 'n') { + /* return number of characters read so far */ + *va_arg(args, int *) = str - buf; + ++fmt; + continue; + } + + if (!*str) break; base = 10; - is_sign = 0; + is_sign = false; switch (*fmt++) { case 'c': @@ -2030,13 +2376,6 @@ int vsscanf(const char *buf, const char *fmt, va_list args) num++; } continue; - case 'n': - /* return number of characters read so far */ - { - int *i = (int *)va_arg(args, int*); - *i = str - buf; - } - continue; case 'o': base = 8; break; @@ -2047,7 +2386,7 @@ int vsscanf(const char *buf, const char *fmt, va_list args) case 'i': base = 0; case 'd': - is_sign = 1; + is_sign = true; case 'u': break; case '%': @@ -2076,58 +2415,61 @@ int vsscanf(const char *buf, const char *fmt, va_list args) || (base == 0 && !isdigit(digit))) break; + if (is_sign) + val.s = qualifier != 'L' ? + simple_strtol(str, &next, base) : + simple_strtoll(str, &next, base); + else + val.u = qualifier != 'L' ? + simple_strtoul(str, &next, base) : + simple_strtoull(str, &next, base); + + if (field_width > 0 && next - str > field_width) { + if (base == 0) + _parse_integer_fixup_radix(str, &base); + while (next - str > field_width) { + if (is_sign) + val.s = div_s64(val.s, base); + else + val.u = div_u64(val.u, base); + --next; + } + } + switch (qualifier) { case 'H': /* that's 'hh' in format */ - if (is_sign) { - signed char *s = (signed char *)va_arg(args, signed char *); - *s = (signed char)simple_strtol(str, &next, base); - } else { - unsigned char *s = (unsigned char *)va_arg(args, unsigned char *); - *s = (unsigned char)simple_strtoul(str, &next, base); - } + if (is_sign) + *va_arg(args, signed char *) = val.s; + else + *va_arg(args, unsigned char *) = val.u; break; case 'h': - if (is_sign) { - short *s = (short *)va_arg(args, short *); - *s = (short)simple_strtol(str, &next, base); - } else { - unsigned short *s = (unsigned short *)va_arg(args, unsigned short *); - *s = (unsigned short)simple_strtoul(str, &next, base); - } + if (is_sign) + *va_arg(args, short *) = val.s; + else + *va_arg(args, unsigned short *) = val.u; break; case 'l': - if (is_sign) { - long *l = (long *)va_arg(args, long *); - *l = simple_strtol(str, &next, base); - } else { - unsigned long *l = (unsigned long *)va_arg(args, unsigned long *); - *l = simple_strtoul(str, &next, base); - } + if (is_sign) + *va_arg(args, long *) = val.s; + else + *va_arg(args, unsigned long *) = val.u; break; case 'L': - if (is_sign) { - long long *l = (long long *)va_arg(args, long long *); - *l = simple_strtoll(str, &next, base); - } else { - unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *); - *l = simple_strtoull(str, &next, base); - } + if (is_sign) + *va_arg(args, long long *) = val.s; + else + *va_arg(args, unsigned long long *) = val.u; break; case 'Z': case 'z': - { - size_t *s = (size_t *)va_arg(args, size_t *); - *s = (size_t)simple_strtoul(str, &next, base); - } - break; + *va_arg(args, size_t *) = val.u; + break; default: - if (is_sign) { - int *i = (int *)va_arg(args, int *); - *i = (int)simple_strtol(str, &next, base); - } else { - unsigned int *i = (unsigned int *)va_arg(args, unsigned int*); - *i = (unsigned int)simple_strtoul(str, &next, base); - } + if (is_sign) + *va_arg(args, int *) = val.s; + else + *va_arg(args, unsigned int *) = val.u; break; } num++; @@ -2137,16 +2479,6 @@ int vsscanf(const char *buf, const char *fmt, va_list args) str = next; } - /* - * Now we've come all the way through so either the input string or the - * format ended. In the former case, there can be a %n at the current - * position in the format that needs to be filled. - */ - if (*fmt == '%' && *(fmt + 1) == 'n') { - int *p = (int *)va_arg(args, int *); - *p = str - buf; - } - return num; } EXPORT_SYMBOL(vsscanf); |