Re: [PATCH] 2.5.59: scanf to honor field widths for numerics

From: James Lamanna (james.lamanna@appliedminds.com)
Date: Fri Feb 07 2003 - 19:46:28 EST


This mailer is incredibly stupid, and I think that some of you may have
gotten a garbled piece of trash as an attachment so here is the patch
inline:

> This is a fix to bug #189, vscanf/scanf ignoring field_widths for
> numerical arguments.
> Please review for inclusion.
> It follows the same semantics as glibc, where '-', '0x', and '0' are
> included in the field_width.

--- linux-2.5.59/lib/vsprintf.c 2003-01-16 18:22:42.000000000 -0800
+++ linux-2.5.59-devel/lib/vsprintf.c 2003-02-07 15:55:46.000000000
-0800
@@ -23,12 +23,13 @@
 #include <asm/div64.h>
 
 /**
- * simple_strtoul - convert a string to an unsigned long
+ * simple_strtoul_width - convert a string to an unsigned long
  * @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
+ * @cendp: End of the string to convert
  */
-unsigned long simple_strtoul(const char *cp,char **endp,unsigned int
base)
+static unsigned long simple_strtoul_width(const char *cp,char
**endp,unsigned int base,const char *cendp)
 {
         unsigned long result = 0,value;
 
@@ -37,14 +38,14 @@
                 if (*cp == '0') {
                         base = 8;
                         cp++;
- if ((*cp == 'x') && isxdigit(cp[1])) {
+ if ((toupper(*cp) == 'X') && isxdigit(cp[1])) {
                                 cp++;
- base = 16;
                         }
                 }
         }
         while (isxdigit(*cp) &&
- (value = isdigit(*cp) ? *cp-'0' : toupper(*cp)-'A'+10) <
base) {
+ (value = isdigit(*cp) ? *cp-'0' : toupper(*cp)-'A'+10) <
base &&
+ cp != cendp) {
                 result = result*base + value;
                 cp++;
         }
@@ -54,25 +55,27 @@
 }
 
 /**
- * simple_strtol - convert a string to a signed long
+ * simple_strtol_width - convert a string to a signed long
  * @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
+ * @cendp: End of the string to convert
  */
-long simple_strtol(const char *cp,char **endp,unsigned int base)
+static long simple_strtol_width(const char *cp,char **endp,unsigned int
base,const char *cendp)
 {
         if(*cp=='-')
- return -simple_strtoul(cp+1,endp,base);
- return simple_strtoul(cp,endp,base);
+ return -simple_strtoul_width(cp+1,endp,base,cendp);
+ return simple_strtoul_width(cp,endp,base,cendp);
 }
 
 /**
- * simple_strtoull - convert a string to an unsigned long long
+ * simple_strtoull_width - convert a string to an unsigned long long
  * @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
+ * @cendp: End of the string to convert
  */
-unsigned long long simple_strtoull(const char *cp,char **endp,unsigned
int base)
+static unsigned long long simple_strtoull_width(const char *cp,char
**endp,unsigned int base,const char *cendp)
 {
         unsigned long long result = 0,value;
 
@@ -81,14 +84,15 @@
                 if (*cp == '0') {
                         base = 8;
                         cp++;
- if ((*cp == 'x') && isxdigit(cp[1])) {
+ if ((toupper(*cp) == 'X') && isxdigit(cp[1])) {
                                 cp++;
                                 base = 16;
                         }
                 }
         }
         while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' :
(islower(*cp)
- ? toupper(*cp) : *cp)-'A'+10) < base) {
+ ? toupper(*cp) : *cp)-'A'+10) < base &&
+ cp != cendp) {
                 result = result*base + value;
                 cp++;
         }
@@ -98,16 +102,41 @@
 }
 
 /**
- * simple_strtoll - convert a string to a signed long long
+ * simple_strtoll_width - convert a string to a signed long long
  * @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
+ * @cendp: End of the string to convert
  */
-long long simple_strtoll(const char *cp,char **endp,unsigned int base)
+static long long simple_strtoll_width(const char *cp,char
**endp,unsigned int base,const char *cendp)
 {
         if(*cp=='-')
- return -simple_strtoull(cp+1,endp,base);
- return simple_strtoull(cp,endp,base);
+ return -simple_strtoull_width(cp+1,endp,base,cendp);
+ return simple_strtoull_width(cp,endp,base,cendp);
+}
+
+unsigned long simple_strtoul(const char *cp, char **endp,
+ unsigned int base)
+{
+ return simple_strtoul_width(cp, endp, base, NULL);
+}
+
+long simple_strtol(const char *cp, char **endp,
+ unsigned int base)
+{
+ return simple_strtol_width(cp, endp, base, NULL);
+}
+
+unsigned long long simple_strtoull(const char *cp, char **endp,
+ unsigned int base)
+{
+ return simple_strtoull_width(cp, endp, base, NULL);
+}
+
+long long simple_strtoll(const char *cp, char **endp,
+ unsigned int base)
+{
+ return simple_strtoll_width(cp, endp, base, NULL);
 }
 
 static int skip_atoi(const char **s)
@@ -516,6 +545,7 @@
 int vsscanf(const char * buf, const char * fmt, va_list args)
 {
         const char *str = buf;
+ const char *strendp;
         char *next;
         char digit;
         int num = 0;
@@ -651,47 +681,49 @@
                     || (base == 0 && !isdigit(digit)))
                                 break;
 
+ strendp = (field_width == -1) ? NULL : str +
field_width;
+
                 switch(qualifier) {
                 case 'h':
                         if (is_sign) {
                                 short *s = (short *) va_arg(args,short
*);
- *s = (short)
simple_strtol(str,&next,base);
+ *s = (short)
simple_strtol_width(str,&next,base,strendp);
                         } else {
                                 unsigned short *s = (unsigned short *)
va_arg(args, unsigned short *);
- *s = (unsigned short)
simple_strtoul(str, &next, base);
+ *s = (unsigned short)
simple_strtoul_width(str,&next, base,strendp);
                         }
                         break;
                 case 'l':
                         if (is_sign) {
                                 long *l = (long *) va_arg(args,long *);
- *l = simple_strtol(str,&next,base);
+ *l =
simple_strtol_width(str,&next,base,strendp);
                         } else {
                                 unsigned long *l = (unsigned long*)
va_arg(args,unsigned long*);
- *l = simple_strtoul(str,&next,base);
+ *l =
simple_strtoul_width(str,&next,base,strendp);
                         }
                         break;
                 case 'L':
                         if (is_sign) {
                                 long long *l = (long long*)
va_arg(args,long long *);
- *l = simple_strtoll(str,&next,base);
+ *l =
simple_strtoll_width(str,&next,base,strendp);
                         } else {
                                 unsigned long long *l = (unsigned long
long*) va_arg(args,unsigned long long*);
- *l = simple_strtoull(str,&next,base);
+ *l =
simple_strtoull_width(str,&next,base,strendp);
                         }
                         break;
                 case 'Z':
                 {
                         size_t *s = (size_t*) va_arg(args,size_t*);
- *s = (size_t) simple_strtoul(str,&next,base);
+ *s = (size_t)
simple_strtoul_width(str,&next,base,strendp);
                 }
                 break;
                 default:
                         if (is_sign) {
                                 int *i = (int *) va_arg(args, int*);
- *i = (int)
simple_strtol(str,&next,base);
+ *i = (int)
simple_strtol_width(str,&next,base,strendp);
                         } else {
                                 unsigned int *i = (unsigned int*)
va_arg(args, unsigned int*);
- *i = (unsigned int)
simple_strtoul(str,&next,base);
+ *i = (unsigned int)
simple_strtoul_width(str,&next,base,strendp);
                         }
                         break;
                 }

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This archive was generated by hypermail 2b29 : Fri Feb 07 2003 - 22:00:24 EST