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fix line-buffered flush omission for odd usage of putc-family functions

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as specified, the int argument providing the character to write is
converted to type unsigned char. for the actual write to buffer,
conversion happened implicitly via the assignment operator; however,
the logic to check whether the argument was a newline used the
original int value. thus usage such as putchar('\n'+0x100) failed to
produce a flush.
This commit is contained in:
Rich Felker 2016-02-10 19:10:34 -05:00
parent 5a6e8d098a
commit 416d1c7a71
1 changed files with 2 additions and 1 deletions

3
src/internal/stdio_impl.h
View File

@ -86,7 +86,8 @@ void __ofl_unlock(void);
#define getc_unlocked(f) \
( ((f)->rpos < (f)->rend) ? *(f)->rpos++ : __uflow((f)) )
#define putc_unlocked(c, f) ( ((c)!=(f)->lbf && (f)->wpos<(f)->wend) \
#define putc_unlocked(c, f) \
( ((unsigned char)(c)!=(f)->lbf && (f)->wpos<(f)->wend) \
? *(f)->wpos++ = (c) : __overflow((f),(c)) )
/* Caller-allocated FILE * operations */