Re: 4gl and C

}Date: Fri, 2 Sep 1994 10:03:29 -0600 (MDT) }From: Con Woodall <cwoodall@vth1.vth.colostate.edu> }Subject: 4gl and C }X-Informix-List-Id: <list.4644> } }A quick cry for expertise if you have been around this problem. I am }trying to use some C functions called from 4gl. I have done this on a }other occasions and though I am not a C programmer, what I am doing }seems to me to be reasonably analogous to what I have done before which }has been successful. } }Generally my 4gl does } }define p_filename char(12) } }call set_params(p_fieldname) } }The c function in question includes } }char *p_fieldname[12]; } }popquote (&*p_fieldname, 12); } }workname = *p_fieldname; } }c globals includes } }char *filename } }The failure of the call causes a segmentation fault and a core dump. I }am also trying to decipher the dump, but I thought someone might have }encountered the problem and see some way around it. By the way the c }compiler does give me a warning on the "workname = *p_fieldname" saying }that the operands are pointers to different types, but I think I might be }stuck with this combination. I have tried a number of other combinations }which the compiler won't let me past. } }Any light shed on the subject would be of benefit. The compiler is doing its best to tell you that your code is wrong... extern char *workname; int set_params(i) int i; { char p_fieldname[13]; /* Note: no star! */ /* Also note that there needs to be space */ /* for a null terminator on the string */ if (i != 1) fgl_fatal(__FILE__, __LINE__, -1318); popquote(p_fieldname, sizeof(p_fieldname)); workname = p_fieldname; return(0); } Your C globals should include: char *workname; or you need to fix set_params() to refer to filename instead of workname. Yours, Jonathan Leffler (johnl@informix.com) #include <disclaimer.h>