Problem using sprintf

[henrik]

Posted on August 08, 2014 at 11:41

Hi community,

I am having trouble using the sprintf function to convert a variable into a string. It compiles just fine if I do

char string[11];
 sprintf(string, ''23'');

And I can see the numer 23 in ''string'' while debugging. But just using a variable instead of the number, like

int data = 23;
 sprintf(string, data);

throws these errors:

undefined reference to `__HEAP_END' SPC563Mxx OS-Less Test Application line 37, external location: \data\distribution\free-entry-toolchain-v4.6.2.1\gcc-4.6.x\libhtcos\ppc-vle\libos_sbrk.c C/C++ Problem
undefined reference to `__HEAP' SPC563Mxx OS-Less Test Application line 0, external location: c:\spc5studio\eclipse\plugins\com.st.tools.spc5.tools.hightec_1.0.0.201306281422\hightec\ppc-ht-eabi\lib\vle\libos.a(libos_sbrk.o) C/C++ Problem
undefined reference to `__HEAP' SPC563Mxx OS-Less Test Application line 42, external location: \data\distribution\free-entry-toolchain-v4.6.2.1\gcc-4.6.x\libhtcos\ppc-vle\libos_sbrk.c C/C++ Problem

I would suspect some compiler/linker issues. Does anybody have any ideas? Best regards Henrik #babycare.com

[Erwan YVIN]

Posted on August 08, 2014 at 17:02

Hello Henrik,

it is linked to the compiler.

the compiler does not provide an implementation of ''sbrk''.

if you copy-paste this following code at the top of main.c

it should compile.

#include <errno.h>

#include ''stdio.h''

void *sbrk(size_t incr) {

  extern uint8_t __heap_base__;

  extern uint8_t __heap_end__;

  static uint8_t *p = &__heap_base__;

  static uint8_t *newp;

  newp = p + incr;

  if (newp > &__heap_end__) {

    errno = ENOMEM;

    return (void *)-1;

  }

  return p = newp;

}

....................

    char string[11];

    int data = 23;

    sprintf(string, ''%d'', data);

Could you try this ?

Anyway , we are opening a ticket for this.

  Best regards

               Erwan

[henrik]

Posted on August 08, 2014 at 17:25

Hello Erwan,

it compiles and sprintf seems to work like it should, afer a quick test.

Thank you very much for the quick help!

Best regards

Henrik

[daewon279]

Posted on August 22, 2014 at 19:39

Hello