summaryrefslogtreecommitdiff
path: root/lib/vsprintf.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/vsprintf.c')
-rw-r--r--lib/vsprintf.c172
1 files changed, 150 insertions, 22 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 7b481cea54ae..fd987b17bda7 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -26,6 +26,9 @@
#include <asm/page.h> /* for PAGE_SIZE */
#include <asm/div64.h>
+/* 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 != 0) \
+ *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;
generated by cgit v1.2.3 (git 2.0.4) at 2024-06-02 20:50:17 +0000