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- strtoimax(), strtoumax(), strtod(), strtof(), strtol(), strtoll(),

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strtoul() and strtoull() now count how many digits were converted.
  If that number is zero, then the conversion is considered to have
  failed: 0 is returned, errno is set to ERANGE and the 'ptr' parameter
  reference is initialized with a pointer to the string to be converted.
  This has two consequences:

     1) A floating point number that has no digits in the significand
        is no longer converted to zero. For example ".e10" can no longer
        result in a successful conversion.

     2) You can detect if a conversion is successful by comparing pointers
        after the conversion function has returned:

           char * str;
           char * ptr;
           long n;

           n = strtol(str,&ptr,10);
           if(n == 0 && str == ptr)
              printf("conversion has failed");


git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@15030 87f5fb63-7c3d-0410-a384-fd976d0f7a62
This commit is contained in:
Olaf Barthel
2005-09-28 09:28:39 +00:00
parent 378e50d2ab
commit 3099f6210a
9 changed files with 190 additions and 62 deletions
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22
library/changes
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@ -1,3 +1,25 @@
- strtoimax(), strtoumax(), strtod(), strtof(), strtol(), strtoll(),
strtoul() and strtoull() now count how many digits were converted.
If that number is zero, then the conversion is considered to have
failed: 0 is returned, errno is set to ERANGE and the 'ptr' parameter
reference is initialized with a pointer to the string to be converted.
This has two consequences:
1) A floating point number that has no digits in the significand
is no longer converted to zero. For example ".e10" can no longer
result in a successful conversion.
2) You can detect if a conversion is successful by comparing pointers
after the conversion function has returned:
char * str;
char * ptr;
long n;
n = strtol(str,&ptr,10);
if(n == 0 && str == ptr)
printf("conversion has failed");
- Following detection of a stack overflow, the startup code eventually
called _exit(). It should have called exit() instead.