problem about sprintf-Collection of common programming errors

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  Rüppell’s Vulture
  c linux sprintf
  I intend to remove sprintf() from my code because its not needed any more in my code
• 
  NLed
  arrays string matlab sprintf
  ForA=[100;300;1000;240]andB=cell(8,1)I have the following results stored in a B[100] [300] [1000] [240] [100;300;240] [100;1000] [300;1000] [100;300;1000]I want to print these to display the output as :choose first choos
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  Pete Wilson
• 
  Señor Reginold Francis
  c sprintf
  I need some help with this, since it baffles me in my C programI have 2 strings(base, and path)BASE: /home/steve/cps730 PATH: /page2.htmlthis is how printf reads then just before I call a sprintf to join their content together. here is the code block int memory_alloc = strlen(filepath)+1;memory_alloc += strlen(BASE_DIR)+1;printf(“\n\nAlloc: %d”,memory_alloc);char *input = (char*)malloc(memory_alloc+9000);printf(“\n\nBASE: %s\nPATH: %s\n\n”,BASE_DIR,filepath);sprintf(input, “%s%s”,BASE_DIR,filepath); // :(printf(“\n\nPATH: %s\n\n”,input);Now, can you explain how the final printf statement returnsPATH: e/steve/cps730e/steve/cps730e/steve/cps730e/steve/cps730e/steve/cps730e/steve/cps730e/steve/cps730e/steve/cps730e/steve/cps730e/steve/cps730e/steve/cps730e/steve/cps730e/steve/cps730e/steve/cps730e/steve/cps730e/steve/cps730e/steve/cps730e/steve/cps730e/steve/c
• 
  EvilTeach
  c malloc printf sprintf sigsegv
  First and foremost, apologies for any cross-posting. Hope I’m not repeating an issue here, but I was unable to find this elsewhere (via Google and Stack Overflow).Here’s the gist of the error. If I call printf, sprintf or fprintf anywhere within my code, to display a float, I get a SIGSEGV (EXC_BAD_ACCESS) error. Let me give an example.The following throws the error:float f = 0.5f; printf(“%f\n”,f);This code does not:float f = 0.5f; printf(“%d\n”,f);I realize there’s an implicit conversion there, but I’m not concerned with that. I just can’t fathom why printing a float vs. printing an integer would throw an error.Note: Part of the code uses malloc to create some very large multidimensional arrays. However, these arrays are not being referenced in any way for these print statements. Here’s an example how I’m declaring these arrays.#define X_LEN 20 #define XDOT_LEN 20 #define THETA_LEN 20 #define THETADOT_LEN 20 #define NUM_STATES (X_LEN+1) * (XDOT_LEN+1) * (THETA_LEN+1) * (THETADOT_LEN+1) #define NUM_ACTS 100float *states = (float *)malloc(NUM_STATES * sizeof(float)); // as opposed to float states[NUM_STATES] (more memory effecient)float **q = (float**)malloc(NUM_STATES * sizeof(float*));for(int i=0; i < NUM_STATES; i++) {float *a = (flo
• 
  Michael Berkowski
  php wordpress sprintf wpdb
  When i try to run my PHP application, i get an error:Fatal error: Call to undefined function __() in J:\sambit\UniServer\www\bbplan_console\in
• 
  Bart Teunissen
  string int type-conversion sprintf
  In my program I try to convert a int to a char[20];I try to do this in the following way:char str[20]; sprintf(str, “%d”, timer);in which timer is t
• 
  zhermes
  c++ c file sprintf fprintf
  I’m sorry, it would be extremely difficult to make a fully reproducible version of the error — so please bare with my schematic code.This program retrieves information from a web page, processes it, and saves output to an ASCII file. I also have a ‘log’ file (FILE *theLog—contained within a Manager object) for reporting errors, etc.Some background methods:// Prints string to log file void Manager::logEntry(const string lstr) {if( theLog != NULL ) { fprintf(theLog, “%s”, lstr.c_str()); } }// Checks if file with given name already exists bool fileExists(const string fname) {FILE *temp;if( temp = fopen(fname.c_str(), “r”) ) { fclose(temp);return true;} else { return false; } }// Initialize file for writing (some components omitted)… bool initFile(FILE *&oFile, const string fname) {if(oFile = fopen(fname.c_str(), “w”) ) { return true; }else { return false; } }The stuff causing trouble:// Gets
• 
  user1058795
  c sprintf stdio
  If I runfilename=”heat.dat”; prtdat(u_x_length, u_y_length, u[iz],filename);it works fine. If I change the first line toprintf(“%d”,sprintf(filename,”heat.dat”
• 
  Zeenobit
  c++ string sprintf va-list
  I’m trying to write a few wrappers for the standard sprintf function from cstdio. However, I’m having some weird behaviour and access violation crashes when running my program. I’ve simplified the problem and reproduced it on the code below:#include #include #include std::s
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  starblue
• 
  detly
  c overflow sprintf
  { char buf[8];sprintf(buf,”AAAA%3s”,”XXXXXXXX”);printf(“%s\n”,buf); }what wil
• 
  Lewis
  c++ string sprintf void-pointers
  After perusing the web and messing around myself, I can’t seem to convert a void*’s target (which is a string) to a std::string. I’ve tried using sprintf(buffer, “%p”, *((int *
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  hmjd
• 
  casperOne
• 
  clamp
  c++ sprintf
  I assume this is a common way to use sprintf:char pText[x]; sprintf(pText, “helloworld %d”,
• 
  bjeanes
  c string char printf sprintf
  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. Furthermore I wanted to see if sprintf could be used to concatenate two strings and set it into a third string.What I discovered was that the third string I was
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  Bo Persson
  c string pointers char sprintf
  I’m currently converting a Csharp programme into Unix C. It’s running well, except:I have an integer (secs) containing a number of seconds that, for aesthetic reasons, I want to display
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  Svante
  c sprintf strncpy
  I have a structure that has an array of pointers. I would like to insert into the array digits in string format, i.e. “1”, “2”, etc..However, is there any difference in using either sprintf or strncpy?Any b
• 
  unwind
  c sprintf
  I have the following code:char temp[32] = “”; sprintf(temp, “%0
• 
  Joachim Pileborg
  c sprintf
  #include #include int main(){char filepath[100];char datevar[15];char command[30];struct tm *t1;time_t now ;time(&now);memcpy(&t1,localtime(&now),sizeof(t1));t1 = localt
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  Piers
  c sprintf
  I have used this type of convention many times in my code in the past:strcpy ( cTmpA, “hello” ); sprintf ( cTmpA, “%s world”, cTmpA
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  Shinka
• 
  mbunit
  ocaml sprintf
  I do not understand why this is the case:Printf.sprintf “%08s” “s” = P
• 
  dthorpe
  c string buffer arduino sprintf
  char *feedtime = “0:0”;String interval = “6”;char* convert(char* x, String y){int hour;int minute;sscanf(x, “%d:%d”, &hour, &minute);ch
• 
  Prasoon Saurav
  c++ c segmentation-fault sprintf
  I stumbled across something “interesting” and I cant put my finger why the behaviour isn’t coherent.Check this code.char buf[100]; sprint(buf,”
• 
  rolls
  c programming-languages sprintf fprintf snprintf
  Here is my code, basically one the 4 computer I have tested it on they all work perfectly with very large data sizes, eg textfiles up to 500mb in size, but when I run them on the server with real data even files as small as 6mb seem to overrun somewhere and writes garbage to the end of my files.Here is the source of the entire function so people can have a more indepth look/** Reads values from tagname between start_time and end_time which are strings in the format of 01/01/1970-12:00, a null string is treated as 01/01/1970, values are stored in”tagname”.csv */ int ReadValues(char * tagname, char * start_time, char * end_time, char * working_directory, char * new_tag_name) {long lRet;int number_of_samples;int loop;IHU_DATA_SAMPLE * pSamples=NULL;IHU_TIMESTAMP StartTime;IHU_TIMESTAMP EndTime;FILE *stream;char outputFileName[200];char szQuality[100];char newTempTagName[100];int Year;int Month;int Day;int Hour;int Minute;int Second;long Subsecond;int date[10];//if we want to change the tagname do it nowif(new_tag_name != 0){strncpy(newTempTagName, new_tag_name, 100);} else {strncpy(newTempTagName, tagname, 100); } // if the tagname contains a character that is invalid for a filename then we have to make a nameif ( (strstr(newTempTagName, “/”)) || (strstr(newTempTagName, “\\”)) || (strstr(newTempTagName, “:”))){sprintf(outputFileName, “MadeUpTag%d”, MadeUpTagCount++);}else{//If a working directory was passed in use itif(!working_directory){ strncpy(outputFileName, newTempTagName,199); } else {strcpy(outputFileName, working_directory); //Copy the working directory to the filename// Append a / on the end of the working directory if it doesn’t already have oneif(outputFileName[strlen(outputFileName)-1] == ‘\”‘){ outputFileName[strlen(outputFileName)-1] = 0;} if(outputFileName[strlen(outputFileName)-1] != ‘\\’){ strncat(outputFileName, “\\”, 199); }strncat(outputFileName, newTempTagName, 199); //Copy the tagname to the end of the working directory}}//Add the csv file extensionstrcat(outputFileName, “.csv”);#ifdef DEBUGprintf(“Output filename: %s\n”, outputFileName);#endifstream = fopen(outputFileName, “w”);if( stream == NULL ) {printf(“The file %s can not be opened\n”, outputFileName );} else {//If start_time == 0 we want to start at 1970if(start_time == 0){// we want all the data so use an old start timestruct tm local;local.tm_year = date[2] – 1900;local.tm_mon = date[1] – 1;local.tm_mday = date[0];local.tm_hour = date[3];local.tm_min = date[4];local.tm_sec = 0;time_t utc_seconds = mktime(&local);StartTime.Seconds = (long)utc_seconds;StartTime.Subseconds = 0; } else {//we have been supplied a start time#ifdef DEBUGprintf(“Start Time: “);#endiflRet = convert_date(start_time, &StartTime);#ifdef DEBUGprintf(“Seconds %ld \n”, StartTime.Seconds);#endif}//if end_time == 0 we want to go all the way until now.if(end_time == 0){// end time of 0 means nowmemset(&EndTime, 0, sizeof(EndTime));} else {//we have been supplied an end time#ifdef DEBU
• 
  Chris
  mysql sql sprintf notin
  I want to fetch a list of items from my database that are not currently within my item array.I have researched that ‘NOT IN’ is the perfect solution to do multiple != ‘NOT EQUAL TO’ in large quantit

Originally posted 2013-11-09 23:24:30.