I'm creating a function in C to convert an index value into a string, which is a verbose description of the "field" represented by the index. So, I have a nice array with all the verbose descriptions indexed by, well the index. To dump it into a buffer I use code like this #define BUFFER_SIZE 40 void format_verbose(uint32_t my_index, ...
My apologies for an inaccurate title, but I'm not sure what this is called exactly. How would one print to the console a single, updating line? For example, if I wanted to print a percent completion status every cycle but not flood the console with steams of text, how would I accomplish this? (What is this called? -- for future Googlin...
Take the following : #include <stdio.h> main() { unsigned long long verybig = 285212672; printf("Without variable : %llu\n", 285212672); printf("With variable : %llu", verybig); } This is the output of the above program : Without variable : 18035667472744448 With variable : 285212672 As you can see from the a...
I have never really done much C but am starting to play around with it. I am writing little snippets like the one below to try to understand the usage and behaviour of key constructs/functions in C. The one below I wrote trying to understand the difference between char* string and char string[] and how then lengths of strings work. Furth...
I have been programming an FTP server in my free time. But I have a problem with sending listings of a directory. I use the Unix format, also used by ls drwxr-xr-x 28 kasper kasper 4096 2009-08-14 01:32 Music drwxr-xr-x 4 kasper kasper 4096 2009-09-06 13:52 Pictures drwxr-xr-x 14 kasper kasper 4096 2009-09-09 18:49 Source drwxr-xr-x 2...
I have a very simple program that just prints the number of newlines as an integer and I get a "D" after every number. Sample input: d [enter] e [enter] f [enter] Ctrl-D [enter] Sample output: 3D What am I doing wrong? This is verbatim from The C Programming Language 2nd edition, pg. 19: #include <stdio.h> main() { int c...
How do I print a char and its equivalent ASCII value in C? ...
So, I'm a bit stymied. According to man 3 printf on my system, the string format "%5s" should use the specified precision to limit the number of characters printed from the string argument given. % man 3 printf PRINTF(3) BSD Library Functions Manual PRINTF(3) NAME printf, fprintf, sprintf, snprintf,...
How to call "printf" directly without including stdio.h ? I found a interesting tutorial here: http://www.halcode.com/archives/2008/05/11/hello-world-c-and-gnu-as/ So, here's my attempt: int main(){ char ss[] = "hello"; asm ( "pushl %ebp ;" "movl %esp, %ebp ;" "subl $4, %esp ;" "movl $ss, (%esp) ;" "call _printf ;" "mov...
so i had an assignment requiring me to 'break' a piece of vulnerable code. snippet: int main(int argc, char **argv) { /*...*/ while(i < argc-1) { switch(argv[i][0]-48) { case 1: SmashHeap(argc,argv); break; /*...*/ case 8: PrintfVulnerability(argv[++i]); break; default: printf("%s ...
Hi, I am trying to get the rounded number of the average load in the past 5 mins. So here goes my command: uptime | awk -F, '{print $5}'|printf "%.0f\n" It seems incorrect as it always give me 0. If I tried to use a variable as intermediate between awk and printf, then it is correct avgload=$(uptime | awk -F, '{print $5}') prin...
My program writes to a log and to stdout. Every message, however, has a certain priority and the user specifies in Preferences which priorities go to which stream (log or stdout). unsigned short PRIO_HIGH = 0x0001; unsigned short PRIO_NORMAL = 0x0002; unsigned short PRIO_LOW = 0x0003; The preferences is handled by some flags: unsign...
When I implement the code below I get the correct dates: 10/05/2008 10/05/2009 When I use printf instead of sprintf, I get the following: 10/05/200910/05/20081 1 Any ideas on why printf prints the trailing 1? #!/usr/bin/perl use strict; use warnings; my ($from_date, $to_date) = to_from_dates(); print "$from_date\n"; print "$t...
Hi! Does anyone know why if i put a printf just before a delay it waits until the delay is finished before it prints de message? Code1 with sleep(): int main (void) { printf ("hi world"); system("sleep 3"); } Code2 with a self implemented delay: void delay(float sec) { time_t start; time_t current; time(&sta...
I would like to know from where inside a huge application a certain message is printed. The application is so big and old that it uses all conceivable ways of printing text to the terminal; for example printf(), fprintf(stdout, ...) etc. I write to put a breakpoint on the write() system call but then I'm flooded with too many breakpoint...
I have some C++ code that prints a size_t: size_t a; printf("%lu", a); I'd like this to compile without warnings on both 32- and 64-bit architectures. If this were C99, I could use printf("%z", a);. But AFAICT %z doesn't exist in any standard C++ dialect. So instead, I have to do printf("%lu", (unsigned long) a); which is really...
Hello! I will be working on a big Assembly project but am now just starting to learn this new language. I am trying to make some simple examples like you might find for c++ in highschool (sum two numbers, is a number prime, etc). Now I've got to display all prime numbers up to n. The problem is that the application freezes at "call pri...
Hello, I'm new at Bison, but in C/C++ no and at this time of development and regular expressions i never heard something like this, only the \n that's used for a new line, but i want to know what is the explanation of \t%.10g, that in the code is like this: line: '\n' | exp '\n' { printf ("\t%.10g\n", $1); } ; Best Rega...
While I was working i came across a code which was written by somebody else. i see a statement as , sprintf(o_params->o_file_name, "%s_%s_%04.4d_%s_%s.ASC", "OUTD", "RM", sequence_no, DateStamp_buf1, TimeStamp_buf1 ); In the above statement, I see %04.4d. Is this a correct format specifier? The variable sequence_no ...
I have a bash shell script which has the line: g=$(/bin/printf ${i}) when ${i} contains something like -6, printf thinks its being passed an option. It does not recognize the option so produces an error. if wrap ${i} in quotes, printf still thinks its being passed an option. g=$(/bin/printf "${i}") if I escape the quotes, variab...