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| author | Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com> | 2016-09-20 14:19:27 -0300 |
|---|---|---|
| committer | Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com> | 2016-10-26 09:56:24 -0200 |
| commit | 726d48ec96f8b8a27e17cffaacb83588589e2f78 (patch) | |
| tree | 49ab897e23e6c65b2a01b5b4500744f252f1d1fe /stdio-common | |
| parent | e863cce57bff6cb795e6aad745ddf6235bca21ce (diff) | |
| download | glibc-726d48ec96f8b8a27e17cffaacb83588589e2f78.tar.gz | |
Use read_int in vfscanf
The function read_int, from printf-parse.h, parses an integer from a string
while avoiding overflows. It is used by other functions, such as vfprintf,
to avoid undefined behavior.
The function vfscanf (_IO_vfwscanf) parses an integer from the format
string, and can use read_int.
Diffstat (limited to 'stdio-common')
| -rw-r--r-- | stdio-common/vfscanf.c | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/stdio-common/vfscanf.c b/stdio-common/vfscanf.c index fe3677ba10..7caa96fbe2 100644 --- a/stdio-common/vfscanf.c +++ b/stdio-common/vfscanf.c @@ -133,6 +133,8 @@ # define WINT_T int #endif +#include "printf-parse.h" /* Use read_int. */ + #define encode_error() do { \ errval = 4; \ __set_errno (EILSEQ); \ @@ -488,9 +490,7 @@ _IO_vfscanf_internal (_IO_FILE *s, const char *format, _IO_va_list argptr, /* Check for a positional parameter specification. */ if (ISDIGIT ((UCHAR_T) *f)) { - argpos = (UCHAR_T) *f++ - L_('0'); - while (ISDIGIT ((UCHAR_T) *f)) - argpos = argpos * 10 + ((UCHAR_T) *f++ - L_('0')); + argpos = read_int ((const UCHAR_T **) &f); if (*f == L_('$')) ++f; else @@ -525,11 +525,8 @@ _IO_vfscanf_internal (_IO_FILE *s, const char *format, _IO_va_list argptr, /* Find the maximum field width. */ width = 0; - while (ISDIGIT ((UCHAR_T) *f)) - { - width *= 10; - width += (UCHAR_T) *f++ - L_('0'); - } + if (ISDIGIT ((UCHAR_T) *f)) + width = read_int ((const UCHAR_T **) &f); got_width: if (width == 0) width = -1; |