C allocating char array causing bad access runtime exception
0
I seem to be having trouble correctly allocating memory for my array. The method is returning as expected, but a runtime exception is killing the program.
I got this exception while using my debugger.
EXC_BAD_ACCESS (code=1, address=0x0)
This is the method causing the issue:
char *progScanner(char *line){
char originalLine[100];
strcpy(originalLine, line);
char *correctLine[100];
char *segment;
int i = 0;
segment = strtok(originalLine," ,()");
while (segment != NULL){
printf (" %s",segment);
correctLine[i++] = segment;
segment = strtok (NULL, " ,()");
}
char *newLine;
newLine = malloc(100 * sizeof(char));
int j = 1;
strcpy (newLine, correctLine[0]);
while(j<=i){
strcat(newLine, correctLine[j]);
j++;
}
return newLine;
}
c memory-management runtime
asked Nov 13 '18 at 22:08
VoxorinVoxorin
177
|
show 2 more comments
0
I seem to be having trouble correctly allocating memory for my array. The method is returning as expected, but a runtime exception is killing the program.
I got this exception while using my debugger.
EXC_BAD_ACCESS (code=1, address=0x0)
This is the method causing the issue:
char *progScanner(char *line){
char originalLine[100];
strcpy(originalLine, line);
char *correctLine[100];
char *segment;
int i = 0;
segment = strtok(originalLine," ,()");
while (segment != NULL){
printf (" %s",segment);
correctLine[i++] = segment;
segment = strtok (NULL, " ,()");
}
char *newLine;
newLine = malloc(100 * sizeof(char));
int j = 1;
strcpy (newLine, correctLine[0]);
while(j<=i){
strcat(newLine, correctLine[j]);
j++;
}
return newLine;
}
c memory-management runtime
asked Nov 13 '18 at 22:08
VoxorinVoxorin
177
Are you sure the original line is less than 100 characters long? If it's longer, you'll cause undefined behavior.
– Barmar
Nov 13 '18 at 22:14
The error indicates that you're trying to dereference a null pointer. Step through the code with a debugger to see where this is happening.
– Barmar
Nov 13 '18 at 22:15
2
while(j<=i)should bewhile(j<i).
– Barmar
Nov 13 '18 at 22:17
1
Unrelated, but the use ofstrcatin a loop like this is a textbook case of Schlemiel The Painter. joelonsoftware.com/2001/12/11/back-to-basics
– Christian Gibbons
Nov 13 '18 at 22:36
@Barmar you're right, please leave an answer. Can't believe I missed that for so long.
– Voxorin
Nov 13 '18 at 23:38
|
show 2 more comments
0
0
0
I seem to be having trouble correctly allocating memory for my array. The method is returning as expected, but a runtime exception is killing the program.
I got this exception while using my debugger.
EXC_BAD_ACCESS (code=1, address=0x0)
This is the method causing the issue:
char *progScanner(char *line){
char originalLine[100];
strcpy(originalLine, line);
char *correctLine[100];
char *segment;
int i = 0;
segment = strtok(originalLine," ,()");
while (segment != NULL){
printf (" %s",segment);
correctLine[i++] = segment;
segment = strtok (NULL, " ,()");
}
char *newLine;
newLine = malloc(100 * sizeof(char));
int j = 1;
strcpy (newLine, correctLine[0]);
while(j<=i){
strcat(newLine, correctLine[j]);
j++;
}
return newLine;
}
c memory-management runtime
asked Nov 13 '18 at 22:08
VoxorinVoxorin
177
I seem to be having trouble correctly allocating memory for my array. The method is returning as expected, but a runtime exception is killing the program.
I got this exception while using my debugger.
EXC_BAD_ACCESS (code=1, address=0x0)
This is the method causing the issue:
char *progScanner(char *line){
char originalLine[100];
strcpy(originalLine, line);
char *correctLine[100];
char *segment;
int i = 0;
segment = strtok(originalLine," ,()");
while (segment != NULL){
printf (" %s",segment);
correctLine[i++] = segment;
segment = strtok (NULL, " ,()");
}
char *newLine;
newLine = malloc(100 * sizeof(char));
int j = 1;
strcpy (newLine, correctLine[0]);
while(j<=i){
strcat(newLine, correctLine[j]);
j++;
}
return newLine;
}
c memory-management runtime
c memory-management runtime
asked Nov 13 '18 at 22:08
VoxorinVoxorin
177
asked Nov 13 '18 at 22:08
VoxorinVoxorin
177
asked Nov 13 '18 at 22:08
VoxorinVoxorin
177
asked Nov 13 '18 at 22:08
VoxorinVoxorin
177
asked Nov 13 '18 at 22:08
VoxorinVoxorin
177
177
Are you sure the original line is less than 100 characters long? If it's longer, you'll cause undefined behavior.
– Barmar
Nov 13 '18 at 22:14
The error indicates that you're trying to dereference a null pointer. Step through the code with a debugger to see where this is happening.
– Barmar
Nov 13 '18 at 22:15
2
while(j<=i)should bewhile(j<i).
– Barmar
Nov 13 '18 at 22:17
1
Unrelated, but the use ofstrcatin a loop like this is a textbook case of Schlemiel The Painter. joelonsoftware.com/2001/12/11/back-to-basics
– Christian Gibbons
Nov 13 '18 at 22:36
@Barmar you're right, please leave an answer. Can't believe I missed that for so long.
– Voxorin
Nov 13 '18 at 23:38
|
show 2 more comments
Are you sure the original line is less than 100 characters long? If it's longer, you'll cause undefined behavior.
– Barmar
Nov 13 '18 at 22:14
The error indicates that you're trying to dereference a null pointer. Step through the code with a debugger to see where this is happening.
– Barmar
Nov 13 '18 at 22:15
2
while(j<=i)should bewhile(j<i).
– Barmar
Nov 13 '18 at 22:17
1
Unrelated, but the use ofstrcatin a loop like this is a textbook case of Schlemiel The Painter. joelonsoftware.com/2001/12/11/back-to-basics
– Christian Gibbons
Nov 13 '18 at 22:36
@Barmar you're right, please leave an answer. Can't believe I missed that for so long.
– Voxorin
Nov 13 '18 at 23:38
Are you sure the original line is less than 100 characters long? If it's longer, you'll cause undefined behavior.
– Barmar
Nov 13 '18 at 22:14
Are you sure the original line is less than 100 characters long? If it's longer, you'll cause undefined behavior.
– Barmar
Nov 13 '18 at 22:14
The error indicates that you're trying to dereference a null pointer. Step through the code with a debugger to see where this is happening.
– Barmar
Nov 13 '18 at 22:15
The error indicates that you're trying to dereference a null pointer. Step through the code with a debugger to see where this is happening.
– Barmar
Nov 13 '18 at 22:15
2
2
while(j<=i) should be while(j<i).– Barmar
Nov 13 '18 at 22:17
while(j<=i) should be while(j<i).– Barmar
Nov 13 '18 at 22:17
1
1
Unrelated, but the use of
strcat in a loop like this is a textbook case of Schlemiel The Painter. joelonsoftware.com/2001/12/11/back-to-basics– Christian Gibbons
Nov 13 '18 at 22:36
Unrelated, but the use of
strcat in a loop like this is a textbook case of Schlemiel The Painter. joelonsoftware.com/2001/12/11/back-to-basics– Christian Gibbons
Nov 13 '18 at 22:36
@Barmar you're right, please leave an answer. Can't believe I missed that for so long.
– Voxorin
Nov 13 '18 at 23:38
@Barmar you're right, please leave an answer. Can't believe I missed that for so long.
– Voxorin
Nov 13 '18 at 23:38
|
show 2 more comments
1 Answer
1
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oldest
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You're accessing outside the correctLine array when you get to j == i, because the last valid index in correctLine is j-1. Change
while(j<=i){
to
while(j<i){
answered Nov 14 '18 at 6:10
BarmarBarmar
423k35248348
add a comment |
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1 Answer
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1 Answer
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votes
0
You're accessing outside the correctLine array when you get to j == i, because the last valid index in correctLine is j-1. Change
while(j<=i){
to
while(j<i){
answered Nov 14 '18 at 6:10
BarmarBarmar
423k35248348
add a comment |
0
You're accessing outside the correctLine array when you get to j == i, because the last valid index in correctLine is j-1. Change
while(j<=i){
to
while(j<i){
answered Nov 14 '18 at 6:10
BarmarBarmar
423k35248348
add a comment |
0
0
0
You're accessing outside the correctLine array when you get to j == i, because the last valid index in correctLine is j-1. Change
while(j<=i){
to
while(j<i){
answered Nov 14 '18 at 6:10
BarmarBarmar
423k35248348
You're accessing outside the correctLine array when you get to j == i, because the last valid index in correctLine is j-1. Change
while(j<=i){
to
while(j<i){
answered Nov 14 '18 at 6:10
BarmarBarmar
423k35248348
answered Nov 14 '18 at 6:10
BarmarBarmar
423k35248348
answered Nov 14 '18 at 6:10
BarmarBarmar
423k35248348
answered Nov 14 '18 at 6:10
BarmarBarmar
423k35248348
423k35248348
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add a comment |
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Are you sure the original line is less than 100 characters long? If it's longer, you'll cause undefined behavior.
– Barmar
Nov 13 '18 at 22:14
The error indicates that you're trying to dereference a null pointer. Step through the code with a debugger to see where this is happening.
– Barmar
Nov 13 '18 at 22:15
2
while(j<=i)should bewhile(j<i).– Barmar
Nov 13 '18 at 22:17
1
Unrelated, but the use of
strcatin a loop like this is a textbook case of Schlemiel The Painter. joelonsoftware.com/2001/12/11/back-to-basics– Christian Gibbons
Nov 13 '18 at 22:36
@Barmar you're right, please leave an answer. Can't believe I missed that for so long.
– Voxorin
Nov 13 '18 at 23:38