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Top Forums Programming Structure element accessing issue... Post 302186380 by Praveen_218 on Thursday 17th of April 2008 04:27:56 AM
Old 04-17-2008
Structure element accessing issue...

Hi all,
Can someone advice, why I'm getting a segmentation fault on a Linux system for a program which looks like the below one--:


typedef struct idev{
int p,
char q[10];
} Idev;

typedef struct abc{
int i;
Idev *idev_ptr;
} ABC;


int main(){
ABC a_var;

char str[10];
int i_var = 0;

/* I received 'a_var' populated by some function call as follows---*/

int result = foo(&a_var);
/*Received result == SUCESS*/

/*initializing str[] to all zero.*/
bzero(str, sizeof(str));

if(a_var.idev_ptr != NULL)
{
/*Access to this is pretty fine*/
i_var = a_var.idev_ptr->p;

/*But accessing array element gives the segmentation fault*/
strncpy(str, a_var.idev_ptr->q, 10);
}


if(a_var.id_q != NULL)
{
free(a_var.i_d); /*freed the memory*/
}

return 0; /*end of the program*/
}


Now please advice me, why I get the segmentation fault by just accessing a_var.idev_ptr->q ???

Last edited by Praveen_218; 04-17-2008 at 07:32 AM..
 

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XcmsColor(3)							  XLIB FUNCTIONS						      XcmsColor(3)

NAME
XcmsColor, XcmsRGB, XcmsRGBi, XcmsCIEXYZ, XcmsCIEuvY, XcmsCIExyY, XcmsCIELab, XcmsCIELuv, XcmsTekHVC, XcmsPad - Xcms color structure STRUCTURES
The structure for XcmsColor contains: typedef unsigned long XcmsColorFormat; /* Color Specification Format */ typedef struct { union { XcmsRGB RGB; XcmsRGBi RGBi; XcmsCIEXYZ CIEXYZ; XcmsCIEuvY CIEuvY; XcmsCIExyY CIExyY; XcmsCIELab CIELab; XcmsCIELuv CIELuv; XcmsTekHVC TekHVC; XcmsPad Pad; } spec; unsigned long pixel; XcmsColorFormat format; } XcmsColor; /* Xcms Color Structure */ typedef double XcmsFloat; typedef struct { unsigned short red; /* 0x0000 to 0xffff */ unsigned short green; /* 0x0000 to 0xffff */ unsigned short blue; /* 0x0000 to 0xffff */ } XcmsRGB; /* RGB Device */ typedef struct { XcmsFloat red; /* 0.0 to 1.0 */ XcmsFloat green; /* 0.0 to 1.0 */ XcmsFloat blue; /* 0.0 to 1.0 */ } XcmsRGBi; /* RGB Intensity */ typedef struct { XcmsFloat X; XcmsFloat Y; /* 0.0 to 1.0 */ XcmsFloat Z; } XcmsCIEXYZ; /* CIE XYZ */ typedef struct { XcmsFloat u_prime; /* 0.0 to ~0.6 */ XcmsFloat v_prime; /* 0.0 to ~0.6 */ XcmsFloat Y; /* 0.0 to 1.0 */ } XcmsCIEuvY; /* CIE u'v'Y */ typedef struct { XcmsFloat x; /* 0.0 to ~.75 */ XcmsFloat y; /* 0.0 to ~.85 */ XcmsFloat Y; /* 0.0 to 1.0 */ } XcmsCIExyY; /* CIE xyY */ typedef struct { XcmsFloat L_star; /* 0.0 to 100.0 */ XcmsFloat a_star; XcmsFloat b_star; } XcmsCIELab; /* CIE L*a*b* */ typedef struct { XcmsFloat L_star; /* 0.0 to 100.0 */ XcmsFloat u_star; XcmsFloat v_star; } XcmsCIELuv; /* CIE L*u*v* */ typedef struct { XcmsFloat H; /* 0.0 to 360.0 */ XcmsFloat V; /* 0.0 to 100.0 */ XcmsFloat C; /* 0.0 to 100.0 */ } XcmsTekHVC; /* TekHVC */ typedef struct { XcmsFloat pad0; XcmsFloat pad1; XcmsFloat pad2; XcmsFloat pad3; } XcmsPad; /* four doubles */ DESCRIPTION
The XcmsColor structure contains a union of substructures, each supporting color specification encoding for a particular color space. SEE ALSO
XcmsAllocColor(3), XcmsStoreColor(3), XcmsConvertColors(3), Xlib - C Language X Interface X Version 11 libX11 1.5.0 XcmsColor(3)
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