jak's articles:

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ptrdiff_t maximum 106 48 (8/22/2010 7:43:59 PM) comp.lang.c # include # include int main (void) { ptrdiff_t const dx = ((ptrdiff_t) ~ ((ptrdiff_t) - 1 < 1 ? (-1 - (((ptrdiff_t) 1 << (sizeof (ptrdiff_t) * 8 - 2)) - 1 + ((ptrdiff_t... John

Symbol for "not" within [] 17 279 (8/8/2010 9:08:13 PM) comp.unix.shell I've been using something like this: [[ a/bc == [^/]*/*[^/] ]] && echo match (the "a/bc" is an example value) to test whether a variable contains a file name having a relative path, and it worke... John

Interix 0 71 (8/6/2010 7:32:46 PM) comp.lang.perl.misc Anyone know if recent Perl tarballs build on Interix 3.5? -- Web mail, POP3, and SMTP http://www.beewyz.com/freeaccounts.php ... John

ANN: The daemon helper 2010-06-04 0 37 (8/2/2010 1:13:31 AM) comp.unix.programmer The daemon helper 2010-06-04 Now it calls initgroups() when root uses the "set user" -u option. This was not necessary with an old kernel I was using, but on newer kernels, setuid() does not automatically in... John

piped open and shell metacharacters 25 29 (7/30/2010 2:39:47 PM) comp.lang.perl.misc The Camel book, 16.3.1. Anonymous Pipes says: > Perl uses your default system shell (/bin/sh on Unix) whenever a pipe > command contains special characters that the shell cares about. If > you're only startin... John

mysqld_safe 0 264 (7/28/2010 1:32:56 PM) comp.unix.shell I compiled a mysql tarball and installed it into /usr/local instead of using my vendor's package. While doing that, I noticed the mysqld_safe shell script does not have any limit on failure restarts. If... John

Two copies of one input stream 1 28 (7/3/2010 5:57:54 AM) comp.unix.shell Two copies of one input stream -- I think I did this before but I forgot how. So I did it again. There's probably a better way, but this works: The "cat >Stream " commands are just a sample; you can replace... John

reader writer semaphores 20 648 (6/20/2010 8:17:17 PM) comp.unix.programmer I found some introductory material on the reader writer problem and semaphores at: http://greenteapress.com/semaphores/ and I want to code a reader writer solution in C, using POSIX semaphores on Linux (for ... John

dp 51 52 (10/26/2009 11:43:33 PM) comp.lang.c (d)aemon (p)rimer Possible alternative name for daemon helper. I emptied my killfile to collect opinions. Any known conflicts? I don't see any in a list of common UNIX utilities. -- Webmail for Dialup U... John

weird environ 7 58 (10/7/2009 4:22:31 PM) comp.unix.programmer On NetBSD 5.0.1 getpwuid fails unless I set a dummy environment variable, which apparently causes the environ memory to be reallocated. I guess this is just a NetBSD bug, but it leads to another question. Wha... John

jak's replies:

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[Q] How far can stack [LIFO] solve do automatic garbage collection and prevent memory leak ? 136 176 (8/16/2010 7:20:17 AM) comp.lang.python [Q] How far can stack [LIFO] solve do automatic garbage collection and prevent memory leak ? Because a stack has push and pop, it is able to release and allocate memory. We envisage an exogenous stack whic... stndshp (27)

make a program that count lines in a text 39 87 (8/17/2010 9:09:19 PM) comp.lang.c I have a program which writes in the date and time into a txt file everytime I turn on my computer. Ex: Tue 08-03-2010 4:27:21.81p Wed 08-04-2010 4:19:29.12p Thu 08-05-2010 6:17:31.65p Fri 08-06-20... jaswinder

How could a char be signed? 45 152 (8/19/2010 9:08:09 AM) comp.lang.c I do not understand how a char could be a signed char. All the ASCII char's are positive numbers. What are signed char's for if they exist. What are the differences between signed char's and unsigned char'... Ann

trim whitespace 106 194 (8/19/2010 7:40:54 PM) comp.lang.c static void trim (char **ts) { unsigned char *exam; unsigned char *keep; if (!*ts) { errno = EINVAL; printf ("trim: %s\n", strerror (errno)); return; } ... John

Where next? 18 332 (8/20/2010 9:05:12 PM) comp.lang.c Hey, I've just finished my book on c and i'm wondering what do I do now? I know about data structures, algorithms etc. but where do I go now to advance my learning and become a professional? Thanking you in... Sarah

trim whitespace, bullet proof version 58 227 (8/21/2010 5:38:51 AM) comp.lang.c trim whitespace, bullet proof version /* Define author John Kelly, August 20, 2010 Define copyright Copyright John Kelly, 2010. All rights reserved. Define licens... John

ptrdiff_t maximum 106 48 (8/22/2010 7:43:59 PM) comp.lang.c # include # include int main (void) { ptrdiff_t const dx = ((ptrdiff_t) ~ ((ptrdiff_t) - 1 < 1 ? (-1 - (((ptrdiff_t) 1 << (sizeof (ptrdiff_t) * 8 - 2)) - 1 + ((ptrdiff_t... jak (362)

trim whitespace v3 121 169 (8/23/2010 7:50:28 AM) comp.lang.c /* Define author John Kelly, August 20, 2010 Define copyright Copyright John Kelly, 2010. All rights reserved. Define license Licensed under the Apache License,... John

Heap Overlays? 7 250 (8/23/2010 8:58:18 PM) comp.lang.c I am running Turbo C 3.0 in a DOS environment on an embedded board with 16MB DRAM installed. The heap at initialization is limited to about 490 kb, and is running out after less than an hour of malloc-ing me... jeff

Reusable source code 74 303 (9/6/2010 5:48:24 PM) comp.lang.c Jacob's mention of his library reminds me of my own suggestion to help with software reusability. Much software has the form High Level -- application-specific code Mid Level -- application-specific... jdallen2000 (489)