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author | June McEnroe <june@causal.agency> | 2020-12-27 22:11:35 -0500 |
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committer | June McEnroe <june@causal.agency> | 2020-12-27 22:11:35 -0500 |
commit | fe5829caffb9fb44a142f8ca9b0213304b0df84a (patch) | |
tree | 1dd744f2648ba894dff816afe48ab4157beafc80 /doc/zlib/gzprintf.3 | |
parent | Add "this commit" option to switch form (diff) | |
parent | Replace Makefile with portable one (diff) | |
download | src-fe5829caffb9fb44a142f8ca9b0213304b0df84a.tar.gz src-fe5829caffb9fb44a142f8ca9b0213304b0df84a.zip |
Add 'doc/zlib/' from commit 'e1ebbcf0ed43f21dd504f1f109e5d12b6bc99460'
git-subtree-dir: doc/zlib git-subtree-mainline: bc52b7578b0ebfc228977342ac7bffc999212197 git-subtree-split: e1ebbcf0ed43f21dd504f1f109e5d12b6bc99460
Diffstat (limited to 'doc/zlib/gzprintf.3')
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1 files changed, 71 insertions, 0 deletions
diff --git a/doc/zlib/gzprintf.3 b/doc/zlib/gzprintf.3 new file mode 100644 index 00000000..a2a241a2 --- /dev/null +++ b/doc/zlib/gzprintf.3 @@ -0,0 +1,71 @@ +.Dd January 15, 2017 +.Dt GZPRINTF 3 +.Os +. +.Sh NAME +.Nm gzprintf +.Nd format output to compressed file +. +.Sh LIBRARY +.Lb libz +. +.Sh SYNOPSIS +.In zlib.h +.Ft int +.Fn gzprintf "gzFile file" "const char *format" "..." +. +.Sh DESCRIPTION +Converts, formats, and writes the arguments +to the compressed file +under control of the format string, +as in +.Xr fprintf 3 . +. +.Sh RETURN VALUES +.Fn gzprintf +returns the number of +uncompressed bytes actually written, +or a negative zlib error code +in case of error. +The number of uncompressed bytes written +is limited to 8191, +or one less than the buffer size given to +.Xr gzbuffer 3 . +The caller should assure that +this limit is not exceeded. +If it is exceeded, +then +.Fn gzprintf +will return an error (0) +with nothing written. +In this case, +there may also be a buffer overflow +with unpredictable consequences, +which is possibly only if zlib +was compiled with the insecure functions +.Xr sprintf 3 +or +.Xr vsprintf 3 +because the secure +.Xr snprintf 3 +or +.Xr vsnprintf 3 +functions +were not available. +This can be determined using +.Xr zlibCompileFlags 3 . +. +.Sh SEE ALSO +.Xr fprintf 3 , +.Xr gzerror 3 , +.Xr gzopen 3 +. +.Sh HISTORY +This manual page was converted from +.In zlib.h +to mdoc format by +.An June McEnroe Aq Mt june@causal.agency . +. +.Sh AUTHORS +.An Jean-loup Gailly Aq Mt jloup@gzip.org +.An Mark Adler Aq Mt madler@alumni.caltech.edu |