Minor Syntax Issues in the /libpng/contrib/gregbook

[Gwihwan-Go]

Hi!
There are some minor grammar issues in the /libpng/contrib/gregbook

/libpng/contrib/gregbook/readpng.c:269:16: 
[error:[Unmatched '('. Configuration: ''. [syntaxError]
[0mfprintf(stderr, "readpng:  image_data buffer would be too large\n",

/libpng/contrib/gregbook/rpng-win.c:190:5: 
[warning:[Return value of function freopen() is not used. 
[ignoredReturnValue][0mfreopen("CONOUT$", "a", stderr);

[1m../libpng/contrib/gregbook/rpng-win.c:596:5: 
[warning:[%ld in format string (no. 1) requires 'long' but the argument type is 'unsigned long'. [invalidPrintfArgType_sint]
[Trace((stderr, "(width = %ld, rowbytes = %ld, wimage_rowbytes = %d)\n",

[jbowler]

Glenn 53f22ae "Document need to check for integer overflow when allocating a pixel...", suggested by Jaeseung Choi.

Clearly no one has ever tried to compile this code (the lines in question were straight adds; "," at the end rather than ");")

@ctruta: perhaps remove contrib/gregbook? This code used to compile and be tested (by Glenn) but this change has been there since 2019 and, apparently, someone only noticed five years later!

Time for it to go.

for f in contrib/*/*.c; do gcc -c "$f" 2>/dev/null || echo "$f does not compile"; done

Some of them don't compile because of headers, like "<windows.h>" but maybe half don't compile because they have been broken and have never been tested since. These need to go!vi