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henrik
henrik
Associate
August 8, 2014
Question

Problem using sprintf

  • August 8, 2014
  • 3 replies
  • 2399 views
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
    This topic has been closed for replies.

    3 replies

    Erwan YVIN
    Erwan YVIN
    ST Technical Moderator
    August 8, 2014
    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

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    henrik
    henrikAuthor
    Associate
    August 8, 2014
    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
    daewon279
    Visitor II
    August 22, 2014
    Posted on August 22, 2014 at 19:39

    Hello

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