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author | tjr <tjr@FreeBSD.org> | 2002-08-31 14:16:12 +0000 |
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committer | tjr <tjr@FreeBSD.org> | 2002-08-31 14:16:12 +0000 |
commit | ca719015df3d7025ed5dab68f072529d15e9bde1 (patch) | |
tree | ae8df1a0ce3a83d40f146b0d2bcd6befaa55ce7f /lib/libc/locale/wcstombs.c | |
parent | 624d02ba22e582550b9128552e7d8ceba6c3748b (diff) | |
download | FreeBSD-src-ca719015df3d7025ed5dab68f072529d15e9bde1.zip FreeBSD-src-ca719015df3d7025ed5dab68f072529d15e9bde1.tar.gz |
Implement the XSI extension which allows the destination string to be
NULL, and returns the number of bytes that would be required to store
the result of the conversion without storing anything.
PR: 17694
Diffstat (limited to 'lib/libc/locale/wcstombs.c')
-rw-r--r-- | lib/libc/locale/wcstombs.c | 29 |
1 files changed, 25 insertions, 4 deletions
diff --git a/lib/libc/locale/wcstombs.c b/lib/libc/locale/wcstombs.c index 987ec30..ed9397a 100644 --- a/lib/libc/locale/wcstombs.c +++ b/lib/libc/locale/wcstombs.c @@ -37,6 +37,7 @@ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); +#include <errno.h> #include <stdlib.h> #include <limits.h> #include <stddef.h> @@ -48,26 +49,46 @@ wcstombs(s, pwcs, n) const wchar_t *pwcs; size_t n; { + char buf[MB_LEN_MAX]; char *e; int cnt, nb; - if (!pwcs || !s || n > INT_MAX) + if (!pwcs || n > INT_MAX) { + errno = EINVAL; return (-1); + } - nb = n; cnt = 0; + + if (s == NULL) { + /* Convert and count only, do not store. */ + while (*pwcs != L'\0') { + if (!sputrune(*pwcs++, buf, MB_LEN_MAX, &e)) { + errno = EILSEQ; + return (-1); + } + cnt += e - buf; + } + return (cnt); + } + + /* Convert, store and count characters. */ + nb = n; while (nb > 0) { if (*pwcs == 0) { *s = 0; break; } - if (!sputrune(*pwcs++, s, nb, &e)) - return (-1); /* encoding error */ + if (!sputrune(*pwcs++, s, nb, &e)) { + errno = EILSEQ; + return (-1); + } if (!e) /* too long */ return (cnt); cnt += e - s; nb -= e - s; s = e; } + return (cnt); } |