http://cpp.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b?format=rss Tribe.net. Local Connections http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#96e40d5e-2cfa-4ca5-8641-706ae037d99a Jason, Right on -- that's what I was trying to say by stating that strings are safer when using C++-specific ways of dealing with them. If you can't, though -- use the strnX functions instead of the strX ones ... but really, just make your life easier and use C++ strings (std::string and friends). Regards, John Falling You - exploring the beauty of voice and sound http://www.fallingyou.com Fri, 03 Feb 2006 04:32:04 GMT http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#96e40d5e-2cfa-4ca5-8641-706ae037d99a John Michael 2006-02-03T04:32:04Z http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#aa7d3f90-fc1d-4d2d-93af-12cb84e6ee16 As a side-note many of the strcpy library functions are considered dangerous due to their naivete with respect to buffer overflow security attacks. These days, if you are programming anything serious, its important to a moment to understand them and use safe variations where appropriate. https://buildsecurityin.us-cert.gov/portal/article/knowledge/coding_rules/RULE_0149.xml Fri, 03 Feb 2006 02:56:09 GMT http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#aa7d3f90-fc1d-4d2d-93af-12cb84e6ee16 Jason 2006-02-03T02:56:09Z http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#7a80b824-898b-4f80-9dca-d9aa087783a8 http://www.gotfuturama.com/Multimedia/EpisodeSounds/4ACV06/03.mp3 Thu, 02 Feb 2006 05:23:26 GMT http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#7a80b824-898b-4f80-9dca-d9aa087783a8 Jon 2006-02-02T05:23:26Z http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#e5daaf20-d3f4-4091-8595-e14bcd426b4e WTL, If you're going to go C++, things get a lot better (once you get comfy with C++, it can be a lot different than C) -- streams are much safer than char arrays, and ostringstream is much safer than sprintf. Regards, John Falling You - exploring the beauty of voice and sound http://www.fallingyou.com Thu, 02 Feb 2006 01:50:43 GMT http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#e5daaf20-d3f4-4091-8595-e14bcd426b4e John Michael 2006-02-02T01:50:43Z http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#a0d7f7d1-c84f-4417-aa6e-bf1ff00010ec As a bit of a follow up, thanks for the pointers folks. I managed to beat the code with a stick long enough to get it to do what I wanted. And then a few days later (of course) , the client changed the requirement that it be done in C and asked for additional functionality, so I re-wrote it in Perl. But, I went out and picked up a newer C++ manual and see what I was doing wrong. Thanks again! Wed, 01 Feb 2006 20:41:30 GMT http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#a0d7f7d1-c84f-4417-aa6e-bf1ff00010ec WTL 2006-02-01T20:41:30Z http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#616098de-e1f5-4122-9fc4-949da2698dbe also if you force it to compile by using casts or taking the addr of it you will likely crash. You have only a single byte reserved for your "string" so anything concatenated on the end of it would overwrite memory it hadn't reserved. Sat, 14 Jan 2006 06:51:48 GMT http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#616098de-e1f5-4122-9fc4-949da2698dbe Hypno 2006-01-14T06:51:48Z http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#fe9f496e-5178-4e75-a0f0-e08c1d70f702 WTL, ... oh, and just to make sure, this is a really common error with beginning C and C++ developers. I remember running into the very same thing when I first learned C, waaaay back in 1986 on an Atari 1040ST (I believe it was the Metacompco C compiler). Anyway, what Jon says is also true -- sprintf can be your friend here as well. Regards, John, who interestingly enough is on a straight-C project currently (adding functionality to the VideoLAN client) Falling You - exploring the beauty of voice and sound http://www.fallingyou.com Sat, 14 Jan 2006 03:36:49 GMT http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#fe9f496e-5178-4e75-a0f0-e08c1d70f702 John Michael 2006-01-14T03:36:49Z http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#ae109db8-53de-4704-a2ea-3f0433250e83 sprintf() is also a powerful concatenation function. Sat, 14 Jan 2006 03:13:50 GMT http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#ae109db8-53de-4704-a2ea-3f0433250e83 Jon 2006-01-14T03:13:50Z http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#1f5cce1b-845e-4b3b-ac89-c22aabc58702 WTL, I believe strcat() takes char *'s as arguments, which is why it's complaining -- a char isn't a char *. Also, strcat expects the source strings to be null-terminated. The following example illustrates one usage: #include <stdio.h> #include <stdlib.h> #include <string.h> int main( int iArgc, char *pArgv[] ) { char *cA = "A"; char *cB = "B"; char cDest[10] = {0}; strcat( cDest, cA ); strcat( cDest, cB ); printf( "%s\n", cDest ); return 1; } PugsleyButt:~/devstuff/c jmzorko$ gcc strcat.c -o strcat PugsleyButt:~/devstuff/c jmzorko$ ./strcat AB I hope this helps. BTW, the string handling in C++ is much better than that in C, but yeah, sometimes ya just got no choice! Regards, John Falling You - exploring the beauty of voice and sound http://www.fallingyou.com Sat, 14 Jan 2006 01:12:02 GMT http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#1f5cce1b-845e-4b3b-ac89-c22aabc58702 John Michael 2006-01-14T01:12:02Z http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#fd62a256-a7da-4795-a74a-f9680712de4a I am writing a program in C but I am getting an error when it compiles that doesn't make any sense: Warning: passing argument 1 of 'strcat' makes pointer from integer without a cast. The relevant bits of code are: The variables: char da = 'A'; char db = 'C'; char dc = 'G'; char dd = 'T'; char dna1 [100000]; Where the error appears: if(random == 1) strcat(da, dna1); else if (random == 2) strcat(db, dna1); else if (random == 3) strcat(dc, dna1); else strcat(dd, dna1); It doesn't like strcat for some reason. Both are chars, so it *should* work as far as I can tell. Anyone have any suggestions to a c newbie? Thanks! Sat, 14 Jan 2006 00:34:37 GMT http://CPP.tribe.net/thread/12556948-c28e-48bf-a528-83b26f286c5b#fd62a256-a7da-4795-a74a-f9680712de4a WTL 2006-01-14T00:34:37Z