derkgwen's articles:

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Re: bitwise absolute value 7 72 (9/10/2003 5:18:23 AM) comp.lang.c # That works, but it assumes 32 bit integers. Is there a # portable/standard way to do this? Or are ANSI integers assert(-1==~0); /*twos complement*/ signx = x>>(sizeof x*CHAR_BIT) absx = (x ^ signx)-signx; ... Derk

Re: want a "here doc" equivalent in "c" 0 29 (9/4/2003 6:46:40 AM) comp.lang.c char *text[] = { /*X*/ "line 1\n", "line 2\n", ..., "line n\n", /*Y*/ 0 }; char **t; FILE *script = fopen("scriptpath","w"); int rc; for (t=text; *t; t++) fputs(*t,script); fclose(script); rc = system("sh... Derk

The Agony and the Ecstasy 1 18 (7/13/2003 4:46:12 AM) comp.lang.tcl I finally upgraded to 8.4.3 knowing what a joy that would be. The agony: trying to use the shipped Tcl.pbproj and Wish.pbproj. The ecstasy: I abandonned them and got projects that work properly. I wrote my ow... Derk

derkgwen's replies:

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Increasing efficiency in C 93 37 (3/3/2004 10:07:25 PM) comp.lang.c As everybody knows, C uses a zero delimited unbounded pointer for its representation of strings. This is extremely inefficient because at each query of the length of the string, the computer starts an unbounde... jacob (2538)

Pointer-to-function with variable argument number 5 21 (3/4/2004 12:15:11 AM) comp.lang.c Hi! Why do I get a warning about incompatible pointer type if I try to assign a pointer to the function with variable argument number: int func (int argc, ...) , but everything is ok when I'm using a sim... andrej.prsa (18)

extern local variables 3 27 (3/4/2004 1:13:31 PM) comp.lang.c void myfunction(void) { extern int myvariable; return ; } what is the point in allowing local variables to have external linkage? its scope is only myfunction so it can't be used anywhere else.... j0mbolar (80)

lsort (-index : multiple indexes) and (tk)table 1 35 (3/5/2004 11:06:15 AM) comp.lang.tcl I need to display a tabular list of records (zip name...) and have it sorted relatively to several criteria (first zip, then name, then...) and switching the order (by clicking in the comumns). So ok, I found t... thomas.lissajoux (1)

strip extra spaces 13 15 (3/7/2004 3:51:25 AM) comp.lang.tcl I know I've seen methods for stripping extras white space from a string but can't seem to find it on the wiki now. I pefer to avoid regexp because I've never gotten any kind of handle over it. The following wor... tuxfordNOSPAM (129)

how to "wait for any key" 4 35 (3/7/2004 3:11:33 PM) comp.lang.c What is the most portable way of "waiting for any key", i.e. the user who runs a program from the console should observe the following: - the program stops running - as soon as the user presses any keyboard k... alexloeschediesmalk (4)

read a single line of a text file 3 16 (3/7/2004 9:34:13 PM) comp.lang.tcl As total newbee in file handling in tcl/tk, i would like to know how to read single lines of a text file into tcl. The way I think it should be done by a " read $filehandler 1 " command and search for an end o... ReactbyNewsGroupPost (1)

How to capture output of a program in realtime 7 26 (4/5/2004 2:53:49 PM) comp.lang.tcl I If I would capture of a program like mkisofs for example, and redirect stdout on my .text widget in realtime, how can I do? I tried with this script, but doesn't work: package require Tk text .text1 set ... dpphln (4)

trying to read a file 4 27 (4/10/2004 7:09:01 PM) comp.lang.c Hi everyone, I'm trying to read the first line of a file this way: .... .... .... .... new_line=0; while((read=read(fd, &info, sizeof(info))) > 0 && !new_line){ if (strcmp(&info, "\n") != 0){ strca... qwe1 (1)

Solving problem in linear time 2 28 (4/14/2004 1:16:11 AM) comp.programming Hi, Could someone suggest how to solve this problem. There're two algorithms A and B which solve a problem X. Given, for every input length n, A runs in time cn or B runs in time dn. When you have input n it... ag165 (5)