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PO1 array into 2 string arrays with malloc problems and pass by ref
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18950391
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AcceptedAnswerId
18950422
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2
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0
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CreationDate
2013-09-23T01:00:51.547
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0
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2013-09-23T17:36:26.833
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1325236
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0
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1
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text
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HI I am working on something for one of my classes.. Im trying to take in this array of strings, break it up into 2 arrays and return back to the caller.. I am new to C, so if you could help, be very helpful, thanks... Right now I get a compile warning, and then a Segfault when I run it. I've been trying many things such as changing the method signature by adding *'s and passing by &.. but it seems not to work.. I prolly am doing a bunch of stuff wrong... pls help.. what I want is to return 2 arrays back to main() with pList[0] = "less" and cList[0] = "ls" and cList[1] = "-t" ...from the function by passing in by reference.. heres my code so far <pre><code>#include <stdio.h> #include <unistd.h> #include <sys/types.h> #include <errno.h> #include <string.h> void makeLists(char **args, char*** parentList, char*** childList, int *childEnd, int *parentEnd) { int i; int foundPipeAt = 0; int total = 0; for(i = 0; i < 4; i++) { total++; if (strcmp(args[i], "|") == 0) { foundPipeAt = i; } } *parentList = malloc((foundPipeAt-1) * sizeof(char*)); *childList = malloc((total-(foundPipeAt)) * sizeof(char*)); printf("foundPipe %d\n", foundPipeAt); for (i = 0 ; i < foundPipeAt ; i++ ) { *parentList[i] = (char *) malloc( (strlen(args[i])+1) * sizeof(char)); *parentList[i] = args[i]; printf("Parent List: %s\n", *parentList[i]); } // Set values for Parent end *parentEnd = foundPipeAt-1; *childEnd = total-foundPipeAt; int k=0; for (i = foundPipeAt+1 ; i < total ; i++ ) { *childList[k] = malloc((strlen(args[i])+1) * sizeof(char)); *childList[k] = args[i]; // This prints correctly... printf("Child List: %s\n", *childList[k]); k++; } } main() { int i; char *args[4]; args[0] = "ls"; args[1] = "-t"; args[2] = "|"; args[3] = "less"; char **pList; char **cList; int parentEnd, childEnd; makeLists(args, &pList, &cList, &childEnd, &parentEnd); } </code></pre>
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<c>
Title
1 array into 2 string arrays with malloc problems and pass by ref
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PostAcceptedAnswerId
1. PO
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 PostTypePostTypeId
 PTAnswer
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1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USJohn
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1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
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 PostTypePostTypeId
 PTAnswer
2. PO
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 PTAnswer
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1. VO
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 PO1 array into 2 string arrays with malloc problems and pass by ref
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