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Diffstat (limited to 'src/lib9/fmt/sprint.c')
-rw-r--r-- | src/lib9/fmt/sprint.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/lib9/fmt/sprint.c b/src/lib9/fmt/sprint.c new file mode 100644 index 000000000..38d430744 --- /dev/null +++ b/src/lib9/fmt/sprint.c @@ -0,0 +1,45 @@ +/* + * The authors of this software are Rob Pike and Ken Thompson, + * with contributions from Mike Burrows and Sean Dorward. + * + * Copyright (c) 2002-2006 by Lucent Technologies. + * Portions Copyright (c) 2004 Google Inc. + * + * Permission to use, copy, modify, and distribute this software for any + * purpose without fee is hereby granted, provided that this entire notice + * is included in all copies of any software which is or includes a copy + * or modification of this software and in all copies of the supporting + * documentation for such software. + * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED + * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES + * NOR GOOGLE INC MAKE ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING + * THE MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. + */ + +#include <u.h> +#include <libc.h> +#include "fmtdef.h" + +int +sprint(char *buf, char *fmt, ...) +{ + int n; + uint len; + va_list args; + + len = 1<<30; /* big number, but sprint is deprecated anyway */ + /* + * on PowerPC, the stack is near the top of memory, so + * we must be sure not to overflow a 32-bit pointer. + * + * careful! gcc-4.2 assumes buf+len < buf can never be true and + * optimizes the test away. casting to uintptr works around this bug. + */ + if((uintptr)buf+len < (uintptr)buf) + len = -(uintptr)buf-1; + + va_start(args, fmt); + n = vsnprint(buf, len, fmt, args); + va_end(args); + return n; +} |