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.cit 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