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musl: stdio: check if stream is writable earlier in fputs() and friends

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This commit is contained in:
Yu Watanabe
2025-11-15 05:10:33 +09:00
parent 08d207ba73
commit 384e88a238
4 changed files with 103 additions and 0 deletions
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src/include/musl/stdio.h
+18
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@@ -11,3 +11,21 @@
int missing_renameat2(int __oldfd, const char *__old, int __newfd, const char *__new, unsigned __flags);
# define renameat2 missing_renameat2
#endif
/* When a stream is opened read-only under glibc, fputs() and friends fail with EBADF. However, they
* succeed under musl. We rely on the glibc behavior in the code base. The following _check_writable()
* functions first check if the passed stream is writable, and refuse to write with EBADF if not. */
int putc_check_writable(int c, FILE *stream);
int putc_unlocked_check_writable(int c, FILE *stream);
int fputc_check_writable(int c, FILE *stream);
int fputc_unlocked_check_writable(int c, FILE *stream);
int fputs_check_writable(const char *s, FILE *stream);
int fputs_unlocked_check_writable(const char *s, FILE *stream);
#define putc putc_check_writable
#define putc_unlocked putc_unlocked_check_writable
#define fputc fputc_check_writable
#define fputc_unlocked fputc_unlocked_check_writable
#define fputs fputs_check_writable
#define fputs_unlocked fputs_unlocked_check_writable