X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2Fvsprintf.c;h=6021757a449663074cded737138d31acd83da325;hb=7916c3548e53bffb0545a1d0dc7fde86d79add92;hp=6b6734df6d2df692b7d3d180220f9eb663fc3142;hpb=939ab20152390c8ccccfa6fac0830405ca91d903;p=linux-2.6-omap-h63xx.git diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 6b6734df6d2..6021757a449 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -26,6 +26,9 @@ #include /* for PAGE_SIZE */ #include +/* Works only for digits and letters, but small and fast */ +#define TOLOWER(x) ((x) | 0x20) + /** * simple_strtoul - convert a string to an unsigned long * @cp: The start of the string @@ -41,17 +44,17 @@ unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base) if (*cp == '0') { base = 8; cp++; - if ((toupper(*cp) == 'X') && isxdigit(cp[1])) { + if ((TOLOWER(*cp) == 'x') && isxdigit(cp[1])) { cp++; base = 16; } } } else if (base == 16) { - if (cp[0] == '0' && toupper(cp[1]) == 'X') + if (cp[0] == '0' && TOLOWER(cp[1]) == 'x') cp += 2; } while (isxdigit(*cp) && - (value = isdigit(*cp) ? *cp-'0' : toupper(*cp)-'A'+10) < base) { + (value = isdigit(*cp) ? *cp-'0' : TOLOWER(*cp)-'a'+10) < base) { result = result*base + value; cp++; } @@ -92,17 +95,17 @@ unsigned long long simple_strtoull(const char *cp,char **endp,unsigned int base) if (*cp == '0') { base = 8; cp++; - if ((toupper(*cp) == 'X') && isxdigit(cp[1])) { + if ((TOLOWER(*cp) == 'x') && isxdigit(cp[1])) { cp++; base = 16; } } } else if (base == 16) { - if (cp[0] == '0' && toupper(cp[1]) == 'X') + if (cp[0] == '0' && TOLOWER(cp[1]) == 'x') cp += 2; } - while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp) - ? toupper(*cp) : *cp)-'A'+10) < base) { + while (isxdigit(*cp) + && (value = isdigit(*cp) ? *cp-'0' : TOLOWER(*cp)-'a'+10) < base) { result = result*base + value; cp++; } @@ -126,6 +129,129 @@ long long simple_strtoll(const char *cp,char **endp,unsigned int base) return simple_strtoull(cp,endp,base); } + +/** + * strict_strtoul - convert a string to an unsigned long strictly + * @cp: The string to be converted + * @base: The number base to use + * @res: The converted result value + * + * strict_strtoul converts a string to an unsigned long only if the + * string is really an unsigned long string, any string containing + * any invalid char at the tail will be rejected and -EINVAL is returned, + * only a newline char at the tail is acceptible because people generally + * change a module parameter in the following way: + * + * echo 1024 > /sys/module/e1000/parameters/copybreak + * + * echo will append a newline to the tail. + * + * It returns 0 if conversion is successful and *res is set to the converted + * value, otherwise it returns -EINVAL and *res is set to 0. + * + * simple_strtoul just ignores the successive invalid characters and + * return the converted value of prefix part of the string. + */ +int strict_strtoul(const char *cp, unsigned int base, unsigned long *res); + +/** + * strict_strtol - convert a string to a long strictly + * @cp: The string to be converted + * @base: The number base to use + * @res: The converted result value + * + * strict_strtol is similiar to strict_strtoul, but it allows the first + * character of a string is '-'. + * + * It returns 0 if conversion is successful and *res is set to the converted + * value, otherwise it returns -EINVAL and *res is set to 0. + */ +int strict_strtol(const char *cp, unsigned int base, long *res); + +/** + * strict_strtoull - convert a string to an unsigned long long strictly + * @cp: The string to be converted + * @base: The number base to use + * @res: The converted result value + * + * strict_strtoull converts a string to an unsigned long long only if the + * string is really an unsigned long long string, any string containing + * any invalid char at the tail will be rejected and -EINVAL is returned, + * only a newline char at the tail is acceptible because people generally + * change a module parameter in the following way: + * + * echo 1024 > /sys/module/e1000/parameters/copybreak + * + * echo will append a newline to the tail of the string. + * + * It returns 0 if conversion is successful and *res is set to the converted + * value, otherwise it returns -EINVAL and *res is set to 0. + * + * simple_strtoull just ignores the successive invalid characters and + * return the converted value of prefix part of the string. + */ +int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res); + +/** + * strict_strtoll - convert a string to a long long strictly + * @cp: The string to be converted + * @base: The number base to use + * @res: The converted result value + * + * strict_strtoll is similiar to strict_strtoull, but it allows the first + * character of a string is '-'. + * + * It returns 0 if conversion is successful and *res is set to the converted + * value, otherwise it returns -EINVAL and *res is set to 0. + */ +int strict_strtoll(const char *cp, unsigned int base, long long *res); + +#define define_strict_strtoux(type, valtype) \ +int strict_strtou##type(const char *cp, unsigned int base, valtype *res)\ +{ \ + char *tail; \ + valtype val; \ + size_t len; \ + \ + *res = 0; \ + len = strlen(cp); \ + if (len == 0) \ + return -EINVAL; \ + \ + val = simple_strtoul(cp, &tail, base); \ + if ((*tail == '\0') || \ + ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {\ + *res = val; \ + return 0; \ + } \ + \ + return -EINVAL; \ +} \ + +#define define_strict_strtox(type, valtype) \ +int strict_strto##type(const char *cp, unsigned int base, valtype *res) \ +{ \ + int ret; \ + if (*cp == '-') { \ + ret = strict_strtou##type(cp+1, base, res); \ + if (!ret) \ + *res = -(*res); \ + } else \ + ret = strict_strtou##type(cp, base, res); \ + \ + return ret; \ +} \ + +define_strict_strtoux(l, unsigned long) +define_strict_strtox(l, long) +define_strict_strtoux(ll, unsigned long long) +define_strict_strtox(ll, long long) + +EXPORT_SYMBOL(strict_strtoul); +EXPORT_SYMBOL(strict_strtol); +EXPORT_SYMBOL(strict_strtoll); +EXPORT_SYMBOL(strict_strtoull); + static int skip_atoi(const char **s) { int i=0; @@ -237,24 +363,25 @@ static noinline char* put_dec(char *buf, unsigned long long num) #define PLUS 4 /* show plus */ #define SPACE 8 /* space if plus */ #define LEFT 16 /* left justified */ -#define SPECIAL 32 /* 0x */ -#define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */ +#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) { - char sign,tmp[66]; - const char *digits; - /* we are called with base 8, 10 or 16, only, thus don't need "g..." */ - static const char small_digits[] = "0123456789abcdefx"; /* "ghijklmnopqrstuvwxyz"; */ - static const char large_digits[] = "0123456789ABCDEFX"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ + /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ + static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ + + char tmp[66]; + char sign; + char locase; int need_pfx = ((type & SPECIAL) && base != 10); int i; - digits = (type & LARGE) ? large_digits : small_digits; + /* 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; - if (base < 2 || base > 36) - return NULL; sign = 0; if (type & SIGN) { if ((signed long long) num < 0) { @@ -281,7 +408,7 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int tmp[i++] = '0'; /* Generic code, for any base: else do { - tmp[i++] = digits[do_div(num,base)]; + tmp[i++] = (digits[do_div(num,base)] | locase); } while (num != 0); */ else if (base != 10) { /* 8 or 16 */ @@ -289,7 +416,7 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int int shift = 3; if (base == 16) shift = 4; do { - tmp[i++] = digits[((unsigned char)num) & mask]; + tmp[i++] = (digits[((unsigned char)num) & mask] | locase); num >>= shift; } while (num); } else { /* base 10 */ @@ -321,7 +448,7 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int ++buf; if (base == 16) { if (buf < end) - *buf = digits[16]; /* for arbitrary base: digits[33]; */ + *buf = ('X' | locase); ++buf; } } @@ -521,6 +648,7 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) continue; case 'p': + flags |= SMALL; if (field_width == -1) { field_width = 2*sizeof(void *); flags |= ZEROPAD; @@ -557,9 +685,9 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) base = 8; break; - case 'X': - flags |= LARGE; case 'x': + flags |= SMALL; + case 'X': base = 16; break; @@ -978,38 +1106,3 @@ int sscanf(const char * buf, const char * fmt, ...) } EXPORT_SYMBOL(sscanf); - - -/* Simplified asprintf. */ -char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap) -{ - unsigned int len; - char *p; - va_list aq; - - va_copy(aq, ap); - len = vsnprintf(NULL, 0, fmt, aq); - va_end(aq); - - p = kmalloc(len+1, gfp); - if (!p) - return NULL; - - vsnprintf(p, len+1, fmt, ap); - - return p; -} -EXPORT_SYMBOL(kvasprintf); - -char *kasprintf(gfp_t gfp, const char *fmt, ...) -{ - va_list ap; - char *p; - - va_start(ap, fmt); - p = kvasprintf(gfp, fmt, ap); - va_end(ap); - - return p; -} -EXPORT_SYMBOL(kasprintf);