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POMemory allocation and core dump for pointers to structures in c
 

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  1. POMemory allocation and core dump for pointers to structures in c
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    <p>Sorry I'm new to memory allocation and structure (so most probably it's some silly thing I've missed). I've got the following code which is core dumping on Solaris. I'm not also sure how to add more elements later (should I realloc memory?)</p> <pre><code> enum field_type { FLD_STRING, FLD_SHORT }; typedef struct { long id; char *name; field_type type; void *value; } myStruct_t ; typedef struct { long id; const char *name; field_type type; const char *descr; } myStructDef_t; myStructDef_t Alldef[] = { {0, "FirstField", FLD_STRING, "First Field Of Structure"}, {1, "SecondField", FLD_STRING, "Second Field Of Structure"}, {-1} }; int main() { myStruct_t *p_struct; char tmp[100] = {'\0'}; long id = 0; if(NULL == (p_struct= structAlloc(1024))) { print("Failed allocating memory\n"); return 0; } sprintf(tmp, "Test Adding value"); addValueToStruct(p_struct, id, (void *)tmp); } myStruct_t *structAlloc(long size) { myStruct_t *tmp = (myStruct_t *) calloc(size, sizeof *tmp); if(NULL != tmp) tmp-&gt;id = -1; return tmp; } int addValueToStruct(myStruct_t *p_struct, long id, (void *)value) { myStruct_t *bkStruct = p_struct; myStructDef_t *def = NULL; if(-1 == getIdDefinition(def, id)) { printf("Failed to find definition for id [%ld]", id); return -1; } // Core dumping on 1st line below bkStruct-&gt;id = def-&gt;id; sprintf(bkStruct-&gt;name, "%s", def-&gt;name); bkStruct-&gt;type = def-&gt;def-&gt;type; if(FLD_SHORT == bkStruct-&gt;type) memcpy(bkStruct-&gt;value, value, sizeof(*(short *)value)); else if(FLD_STRING == bkStruct-&gt;type) memcpy(bkStruct-&gt;value, value, sizeof(*(char *)value)); return 0; } int getIdDefinition(myStructDef_t *def, long id) { myStructDef_t *AllDefsTmp = Alldef; bool found = false; while( -1 != AllDefsTmp-&gt;id) { if(id == AllDefsTmp-&gt;id) { def = AllDefsTmp; found = true; break; } AllDefsTmp ++; } if(!found) return -1; return 0; } </code></pre> <p>Thanks :)</p>
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    1. USwassim
    1. USwassim
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    1. COYour code doesn't compile - `malloc()` does not take two arguments, for example. There are several other compiler errors. But after fixing them, I can see what's wrong...
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      1. USMats Petersson
    2. COyeah, sorry it's just a very fast simplified copy of my original code, was trying calloc as well
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      1. USwassim
 

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