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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LEARN ABOUT DEBIAN
xcmstekhvc
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)