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[devel] Slightly expanded the documentation of PNG_ABORT()

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Glenn Randers-Pehrson 2010-04-02 17:06:22 -05:00
parent f136155383
commit 54ac9a918e
2 changed files with 34 additions and 16 deletions
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21
libpng-1.5.0beta17.txt
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@ -1,6 +1,6 @@
libpng.txt - A description on how to use and modify libpng
libpng version 1.5.0beta17 - April 1, 2010
libpng version 1.5.0beta17 - April 2, 2010
Updated and distributed by Glenn Randers-Pehrson
<glennrp at users.sourceforge.net>
Copyright (c) 1998-2009 Glenn Randers-Pehrson
@ -11,7 +11,7 @@ libpng.txt - A description on how to use and modify libpng
Based on:
libpng versions 0.97, January 1998, through 1.5.0beta17 - April 1, 2010
libpng versions 0.97, January 1998, through 1.5.0beta17 - April 2, 2010
Updated and distributed by Glenn Randers-Pehrson
Copyright (c) 1998-2009 Glenn Randers-Pehrson
@ -241,9 +241,13 @@ free any memory.
}
If you would rather avoid the complexity of setjmp/longjmp issues,
you can compile libpng with PNG_SETJMP_NOT_SUPPORTED, in which case
you can compile libpng with PNG_NO_SETJMP, in which case
errors will result in a call to PNG_ABORT() which defaults to abort().
You can #define PNG_ABORT() to a function that does something
more useful than abort(), as long as your function does not
return.
Now you need to set up the input code. The default for libpng is to
use the C function fread(). If you use this, you will need to pass a
valid FILE * in the function png_init_io(). Be sure that the file is
@ -1691,9 +1695,13 @@ section below for more information on the libpng error handling.
return;
If you would rather avoid the complexity of setjmp/longjmp issues,
you can compile libpng with PNG_SETJMP_NOT_SUPPORTED, in which case
you can compile libpng with PNG_NO_SETJMP, in which case
errors will result in a call to PNG_ABORT() which defaults to abort().
You can #define PNG_ABORT() to a function that does something
more useful than abort(), as long as your function does not
return.
Now you need to set up the output code. The default for libpng is to
use the C function fwrite(). If you use this, you will need to pass a
valid FILE * in the function png_init_io(). Be sure that the file is
@ -2554,8 +2562,9 @@ Error handling in libpng is done through png_error() and png_warning().
Errors handled through png_error() are fatal, meaning that png_error()
should never return to its caller. Currently, this is handled via
setjmp() and longjmp() (unless you have compiled libpng with
PNG_SETJMP_NOT_SUPPORTED, in which case it is handled via PNG_ABORT()),
PNG_NO_SETJMP, in which case it is handled via PNG_ABORT()),
but you could change this to do things like exit() if you should wish.
as long as your function does not return.
On non-fatal errors, png_warning() is called
to print a warning message, and then control returns to the calling code.
@ -3249,7 +3258,7 @@ Other rules can be inferred by inspecting the libpng source.
XIII. Y2K Compliance in libpng
April 1, 2010
April 2, 2010
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.

29
libpng.3
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@ -1,4 +1,4 @@
.TH LIBPNG 3 "April 1, 2010"
.TH LIBPNG 3 "April 2, 2010"
.SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library 1.5.0beta17
.SH SYNOPSIS
@ -789,7 +789,7 @@ Following is a copy of the libpng.txt file that accompanies libpng.
.SH LIBPNG.TXT
libpng.txt - A description on how to use and modify libpng
libpng version 1.5.0beta17 - April 1, 2010
libpng version 1.5.0beta17 - April 2, 2010
Updated and distributed by Glenn Randers-Pehrson
<glennrp at users.sourceforge.net>
Copyright (c) 1998-2009 Glenn Randers-Pehrson
@ -800,7 +800,7 @@ libpng.txt - A description on how to use and modify libpng
Based on:
libpng versions 0.97, January 1998, through 1.5.0beta17 - April 1, 2010
libpng versions 0.97, January 1998, through 1.5.0beta17 - April 2, 2010
Updated and distributed by Glenn Randers-Pehrson
Copyright (c) 1998-2009 Glenn Randers-Pehrson
@ -1030,9 +1030,13 @@ free any memory.
}
If you would rather avoid the complexity of setjmp/longjmp issues,
you can compile libpng with PNG_SETJMP_NOT_SUPPORTED, in which case
you can compile libpng with PNG_NO_SETJMP, in which case
errors will result in a call to PNG_ABORT() which defaults to abort().
You can #define PNG_ABORT() to a function that does something
more useful than abort(), as long as your function does not
return.
Now you need to set up the input code. The default for libpng is to
use the C function fread(). If you use this, you will need to pass a
valid FILE * in the function png_init_io(). Be sure that the file is
@ -2480,9 +2484,13 @@ section below for more information on the libpng error handling.
return;
If you would rather avoid the complexity of setjmp/longjmp issues,
you can compile libpng with PNG_SETJMP_NOT_SUPPORTED, in which case
you can compile libpng with PNG_NO_SETJMP, in which case
errors will result in a call to PNG_ABORT() which defaults to abort().
You can #define PNG_ABORT() to a function that does something
more useful than abort(), as long as your function does not
return.
Now you need to set up the output code. The default for libpng is to
use the C function fwrite(). If you use this, you will need to pass a
valid FILE * in the function png_init_io(). Be sure that the file is
@ -3343,8 +3351,9 @@ Error handling in libpng is done through png_error() and png_warning().
Errors handled through png_error() are fatal, meaning that png_error()
should never return to its caller. Currently, this is handled via
setjmp() and longjmp() (unless you have compiled libpng with
PNG_SETJMP_NOT_SUPPORTED, in which case it is handled via PNG_ABORT()),
PNG_NO_SETJMP, in which case it is handled via PNG_ABORT()),
but you could change this to do things like exit() if you should wish.
as long as your function does not return.
On non-fatal errors, png_warning() is called
to print a warning message, and then control returns to the calling code.
@ -4038,7 +4047,7 @@ Other rules can be inferred by inspecting the libpng source.
.SH XIII. Y2K Compliance in libpng
April 1, 2010
April 2, 2010
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
@ -4278,7 +4287,7 @@ possible without all of you.
Thanks to Frank J. T. Wojcik for helping with the documentation.
Libpng version 1.5.0beta17 - April 1, 2010:
Libpng version 1.5.0beta17 - April 2, 2010:
Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
@ -4301,7 +4310,7 @@ this sentence.
This code is released under the libpng license.
libpng versions 1.2.6, August 15, 2004, through 1.5.0beta17, April 1, 2010, are
libpng versions 1.2.6, August 15, 2004, through 1.5.0beta17, April 2, 2010, are
Copyright (c) 2004,2006-2007 Glenn Randers-Pehrson, and are
distributed according to the same disclaimer and license as libpng-1.2.5
with the following individual added to the list of Contributing Authors
@ -4400,7 +4409,7 @@ certification mark of the Open Source Initiative.
Glenn Randers-Pehrson
glennrp at users.sourceforge.net
April 1, 2010
April 2, 2010
.\" end of man page