diff options
Diffstat (limited to 'docs/Glibc_vs_uClibc_Differences.txt')
| -rw-r--r-- | docs/Glibc_vs_uClibc_Differences.txt | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/docs/Glibc_vs_uClibc_Differences.txt b/docs/Glibc_vs_uClibc_Differences.txt index dcb0d31de..63b0aaaaf 100644 --- a/docs/Glibc_vs_uClibc_Differences.txt +++ b/docs/Glibc_vs_uClibc_Differences.txt @@ -137,6 +137,36 @@ stdio take place on the stream. 8) Right now, %m is not handled properly by printf when the format uses positional args. - +9) The FILEs created by glibc's fmemopen(), open_memstream(), and fopencookie() + are not capable of wide orientation. The corresponding uClibc routines do + not have this limitation. + +glibc bugs that Ulrich Drepper has refused to acknowledge or comment on + ( http://sources.redhat.com/ml/libc-alpha/2003-09/ ) +----------------------------------------------------------------------- +1) The C99 standard says that for printf, a %s conversion makes no special + provisions for multibyte characters. SUSv3 is even more clear, stating + that bytes are written and a specified precision is in bytes. Yet glibc + treats the arg as a multibyte string when a precision is specified and + not otherwise. +2) Both C99 and C89 state that the %c conversion for scanf reads the exact + number of bytes specified by the optional field width (or 1 if not specified). + uClibc complies with the standard. There is an argument that perhaps the + specified width should be treated as an upper bound, based on some historical + use. However, such behavior should be mentioned in the Conformance document. +3) glibc's scanf is broken regarding some numeric patterns. Some invalid + strings are accepted as valid ("0x.p", "1e", digit grouped strings). + In spite of my posting examples clearly illustrating the bugs, they remain + unacknowledged by the glibc developers. +4) glibc's scanf seems to require a 'p' exponent for hexadecimal float strings. + According to the standard, this is optional. +5) C99 requires that once an EOF is encountered, the stream should be treated + as if at end-of-file even if more data becomes available. Further reading + can be attempted by clearing the EOF flag though, via clearerr() or a file + positioning function. For details concerning the original change, see + Defect Report #141. glibc is currently non-compliant, and the developers + did not comment when I asked for their official position on this issue. +6) glibc's collation routines and/or localedef are broken regarding implicit + and explicit UNDEFINED rules. More to follow as I think of it... |