c/9857: string tokenizer causes segmentation faults
ocmbah@unity.ncsu.edu
ocmbah@unity.ncsu.edu
Wed Feb 26 05:46:00 GMT 2003
>Number: 9857
>Category: c
>Synopsis: string tokenizer causes segmentation faults
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Wed Feb 26 05:46:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: ocmbah@unity.ncsu.edu
>Release: gcc version 2.96 20000731 (Red Hat Linux 7.3 2.96-110)
>Organization:
>Environment:
red hate 7.3
>Description:
i noticed some strange behavior with using the strtok() function, it worked normally into my program until i got the bright idea of making a function out of some duplicate code and it mysteriously caused strtok to seg fault even though the functions that i made don't call it
i tried to reproduce this on a smaller scale w/o sending you my program so here's what i came up with, i didn't think this was going to seg fault at all but it did so...
#include <stdio.h>
#include <string.h>
#define DELIMS " \t\n"
typedef struct
{
char uin[9]; /* User ID */
char last[20]; /* Last name */
char first[15]; /* First name */
int grades[6]; /* List of student's 6 grades */
float average; /* Student's average */
} studentRecord;
int main(void)
{
int i;
studentRecord *stuRec;
char *string = "jdoe\tDoe\tJohn\t98\t90\t87\t88\t86\t82\t88.5";
stuRec = (studentRecord *) malloc(sizeof(studentRecord));
strcpy(stuRec->uin, strtok(string, DELIMS));
strcpy(stuRec->last, strtok(NULL, DELIMS));
strcpy(stuRec->first, strtok(NULL, DELIMS));
for(i = 0; i < 6; ++i)
stuRec->grades[i] = atoi(strtok(NULL, DELIMS));
stuRec->average = atof(strtok(NULL, DELIMS));
}
>How-To-Repeat:
just compile the above example with a "gcc filename.c" and do an "./a.out"
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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