gahr's articles:

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freopen and concurrent access 1 32 (10/26/2007 10:26:19 AM) comp.unix.programmer Hi Group, I have processes residing on different hosts logging to the same file, which resides on a NFS mount. The logging is done by freopen'ing stdout with mode "a". I would like the concurrent access to the... Pietro

comparison on non-integer types 39 42 (9/5/2007 5:59:42 PM) comp.lang.c Hi group, I always thought that applying a binary operator such as ==, !=, = to two double or float values was an operation which results were well defined. Now, I'm passing a program through splint[1] and it ... Pietro

undefine for functions 8 29 (8/30/2007 8:23:10 AM) comp.lang.c Hi Group, is there a mean to undefine a function, in a similar way as you can undefine macros? For example, let's say that I need a few declarations from stdio.h but want to define my own printf: #include #u... Pietro

return discards qualifiers from pointer target type 17 24 (8/28/2007 10:42:42 AM) comp.lang.c i Group, to my understanding, defining a function parameter as "const" means that the function is not going to change it. Why does the compiler says "return discards qualifiers from pointer target type" when ... Pietro

safe to fclose stdout to avoid memory leak? 7 36 (8/20/2007 3:35:19 PM) comp.lang.c Hi group, I just noticed that a malloc w/out relative free occurs in the standard C library (or at least, on my implementation of it). > cat test.c #include int main(void) { printf("%s\n", "Hello"); ret... Pietro

pointer points elsewhere, but by changed it? 8 28 (8/17/2007 9:59:30 AM) comp.lang.c Hi group. I have a problem in a program structured like this: void function_1(my_data_t *data); my_data_t *create_data(void); void library_function(void); int main(void) { my_data_t *data; data = create... Pietro

Header file included more than once? 4 25 (8/9/2007 10:56:32 AM) comp.lang.c Hi Group, suppose test1.c, test2.c and test.h /*** BEGIN TEST.H ***/ #ifndef _TEST_H #define _TEST_H typedef struct { unsigned int code; const char *name; } test_struct; test_struct structs[NOF_STR... Pietro

controlling expressions evaluation 15 24 (7/9/2007 12:04:57 PM) comp.lang.c Hi group, here I come with a question which is quite simple per se, but for which I can't find an answer. Does the C standard guarantee that inside an expression such as (x && y) "y" is not evaluated if "x" ... Pietro

char * signedness 17 33 (7/5/2007 10:12:23 PM) comp.lang.c Hi group, is it always safe to pass unsigned char * variables as parameters to functions accepting char * arguments? For instance, I have to compare two unsigned char * strings. Can I safely use strcmp? Do I n... Pietro

ctime(3) gives incorrect results 12 35 (7/3/2007 11:48:29 PM) comp.lang.c Hi group, #include #include #include int main(void) { time_t t1, t2; char *st1, *st2; t1 = time(NULL); if(sleep(1)) { printf("Signal received, exiting\n"); return (1); } t2... Pietro

gahr's replies:

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SCHAR_MIN 15 24 (9/30/2009 8:52:19 AM) comp.lang.c Hello, Why SCHAR_MIN == -127 in the C99 standard? I thought integer types representation is two's complement, and that means that if I have 8 bits I can represent values from -128 to +127... Thanks. ... pi00100100 (8)

Incomplete types #2 31 24 (9/30/2009 9:59:30 AM) comp.lang.c Hello, I learned there are object types (describe objects) and function types (describe functions). Truly there are also incomplete types, but I can't understood what they really are. I read void is an incom... pi00100100 (8)

casting and ++ operators !! 5 30 (9/30/2009 12:47:54 PM) comp.lang.c int main() { char arr[]={1,2,3,4}; char *c=arr; *c++='x'; // works fine *(c+1)++='9'; // l-value needed case 1 void *ptr=arr; *((char *)ptr+1)=8; // works fine *((char *)ptr)++=8; //l-value nee... duggydiggy (1)

database 25 26 (9/30/2009 11:51:13 PM) comp.lang.c Well I have googled and googled and can't find a tutorial on database algorithms. I think I have pretty much given up for now on the tree. The tutorial here has code that just produced a bunch of errors. ... nospam116 (1187)

compare floating point with given digit of precision 13 25 (10/1/2009 10:08:26 AM) comp.lang.c It is possible ? Suppose I've 2 values e.g. -2.3456 and -2.3478, it is possibile to compare as -2.34 and -2.34 ( 2 decimal places ) ? Thanks in advance, Alessio ... fake6867 (34)

A note on Peter Seebach's vicious little tirade 48 28 (10/2/2009 6:05:47 AM) comp.lang.c http://spinoza1111.wordpress.com/2009/10/02/a-note-on-peter-seebachs-viciou= s-little-tirade/ Peter Seebach has written a vicious little tirade on a computer author, Herb Schildt which is at http://www.seebs.... spinoza1111 (3250)

union inside struct - how to get rid of "ISO C" warning? #2 7 33 (10/6/2009 12:53:47 AM) comp.lang.c Hi there, got some tricky problem here: (at least if I want to write good ISO C code) typedef struct { union { USHORT byte [512]; ULONG lword[512/4]; }; } raw_s; Of course, when ... aeibach1 (47)

static into structure 27 32 (10/26/2009 7:26:21 AM) comp.lang.c look at this code .... i am quite confuse why i am getting error while compiling it by gcc. #include struct myStructure { int i; static int si; }; int main() { struct myStructure a; printf("%... sumit15nov (23)

IDE recommendation? 14 40 (11/10/2009 9:18:33 PM) comp.lang.c Hi all, I've been struggling along with just the Linux editing utility nano in conjunction with gcc. It's fine for just a few pages of code, but lately I've been trying to examine how more complex open source ... orion.osiris (37)

Common misconceptions about C (C95) 406 83 (11/18/2009 3:35:56 AM) comp.lang.c I have created a text available under GNU FDL 3 (Free Documenation License) or later, regarding "Common misconceptions about C" (C95). http://www.cpp-software.net/documents/free_documents/c_misconception... Ioannis