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Top Forums Programming C; storing strings in an array Post 302643861 by neutronscott on Sunday 20th of May 2012 10:32:44 PM
Old 05-20-2012
you merely set it to point to that same address each time. C has char type. a string is pointer (char *), so the variable itself is only memory location of the start. the end is when you hit a \0. so when you do line = malloc() you grab enough space for 79 chars and the null. getline writes to it, but it doesn't change the address.. that address stays the same here.

setting a pointer to a pointer only copies the address. you need to copy what's at the address. this requires a loop, continuing either a set length like with memcpy, or until null byte, strcpy.

pointers are sometimes a tough concept to fully grasp

edit: yes, the +1 to the malloc would be so you have room to store a \0 which is needed to terminate strings.
 

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XmStringTableProposeTablist(library call)								 XmStringTableProposeTablist(library call)

NAME
XmStringTableProposeTablist -- A convenience function that returns a tab list SYNOPSIS
#include <Xm/Xm.h> XmTabList XmStringTableProposeTablist( XmStringTable strings, Cardinal num_strings, Widget widget, float pad_value, XmOffsetModel offset_model); DESCRIPTION
XmStringTableProposeTablist takes an XmStringTable structure containing tabbed compound strings, information on padding between columns, and rendering information and returns a tab list that, if used to render the strings in the table, would cause the strings to line up in columns with no overlap and with the specified amount of padding between the widest item in each column and the start of the next column. Each tab in the tablist would have the same unit type as units, an offset model of offset_model, and an alignment type of XmALIGN- MENT_BEGINNING. strings Specifies an array of compound strings. num_strings Specifies the number of compound strings in strings. widget Specifies the widget used for deriving any necessary information for creating the rendition. In particular, the XmNunitType of widget will be used to specify the unit type to be used in determining the amount of padding separating columns and for the tabs in the proposed tab list. Also, widget's render table will be used in interpreting rendition tags within the strings. pad_value Specifies the value of the amount of padding to be used to separate columns. The units for this parameter are specified as the XmNunitType set for the widget parameter. Refer to the XmNunitType resource of the XmGadget, XmManager, or XmPrimitive reference page. offset_model Specifies the offset model to be used in creating the tabs. Can be XmABSOLUTE or XmRELATIVE. RETURN
Returns a new XmTabList. The function allocates space to hold the returned tab list. The application is responsible for managing the allocated space. The application can recover the allocated space by calling XmTabListFree. RELATED
XmTabList(3) and XmTabListFree(3). XmStringTableProposeTablist(library call)
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