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RTBL_FORMAT(3) - Linux manual page online | Library functions

Chapter
June 26, 2004
RTBL(3) BSD Library Functions Manual RTBL(3)

NAME

rtbl_create, rtbl_destroy, rtbl_set_flags, rtbl_get_flags, rtbl_set_prefix, rtbl_set_separator, rtbl_set_column_prefix, rtbl_set_column_affix_by_id, rtbl_add_column, rtbl_add_column_by_id, rtbl_add_column_entry, rtbl_add_column_entry_by_id, rtbl_new_row, rtbl_format — format data in simple tables

LIBRARY

The roken library (libroken, -lroken)

SYNOPSIS

#include <rtbl.h> int rtbl_add_column(rtbl_t table, const char *column_name, unsigned int flags); int rtbl_add_column_by_id(rtbl_t table, unsigned int column_id, const char *column_header, unsigned int flags); int rtbl_add_column_entry(rtbl_t table, const char *column_name, const char *cell_entry); int rtbl_add_column_entry_by_id(rtbl_t table, unsigned int column_id, const char *cell_entry); rtbl_t rtbl_create(void); void rtbl_destroy(rtbl_t table); int rtbl_new_row(rtbl_t table); int rtbl_set_column_affix_by_id(rtbl_t table, unsigned int column_id, const, char, *prefix", const char *suffix); int rtbl_set_column_prefix(rtbl_t table, const char *column_name, const char *prefix); unsigned int rtbl_get_flags(rtbl_t table); void rtbl_set_flags(rtbl_t table, unsigned int flags); int rtbl_set_prefix(rtbl_t table, const char *prefix); int rtbl_set_separator(rtbl_t table, const char *separator); int rtbl_format(rtbl_t table, FILE, *file");

DESCRIPTION

This set of functions assemble a simple table consisting of rows and columns, allowing it to be printed with certain options. Typical use would be output from tools such as ls(1) or netstat(1), where you have a fixed number of columns, but don't know the column widths before hand. A table is created with rtbl_create() and destroyed with rtbl_destroy(). Global flags on the table are set with rtbl_set_flags and retrieved with rtbl_get_flags. At present the only defined flag is RTBL_HEADER_STYLE_NONE which suppresses printing the header. Before adding data to the table, one or more columns need to be created. This would normally be done with rtbl_add_column_by_id(), column_id is any number of your choice (it's used only to identify columns), column_header is the header to print at the top of the column, and flags are flags specific to this column. Currently the only defined flag is RTBL_ALIGN_RIGHT, aligning column entries to the right. Columns are printed in the order they are added. There's also a way to add columns by column name with rtbl_add_column(), but this is less flexible (you need unique header names), and is considered deprecated. To add data to a column you use rtbl_add_column_entry_by_id(), where the column_id is the same as when the column was added (adding data to a non-existent column is undefined), and cell_entry is whatever string you wish to include in that cell. It should not include new‐ lines. For columns added with rtbl_add_column() you must use rtbl_add_column_entry() instead. rtbl_new_row() fills all columns with blank entries until they all have the same number of rows. Each column can have a separate prefix and suffix, set with rtbl_set_column_affix_by_id; rtbl_set_column_prefix allows setting the prefix only by column name. In addition to this, columns may be separated by a string set with rtbl_set_separator (by default columns are not seprated by anything). The finished table is printed to file with rtbl_format.

EXAMPLES

This program: #include <stdio.h> #include <rtbl.h> int main(int argc, char **argv) { rtbl_t table; table = rtbl_create(); rtbl_set_separator(table, " "); rtbl_add_column_by_id(table, 0, "Column A", 0); rtbl_add_column_by_id(table, 1, "Column B", RTBL_ALIGN_RIGHT); rtbl_add_column_by_id(table, 2, "Column C", 0); rtbl_add_column_entry_by_id(table, 0, "A-1"); rtbl_add_column_entry_by_id(table, 0, "A-2"); rtbl_add_column_entry_by_id(table, 0, "A-3"); rtbl_add_column_entry_by_id(table, 1, "B-1"); rtbl_add_column_entry_by_id(table, 2, "C-1"); rtbl_add_column_entry_by_id(table, 2, "C-2"); rtbl_add_column_entry_by_id(table, 1, "B-2"); rtbl_add_column_entry_by_id(table, 1, "B-3"); rtbl_add_column_entry_by_id(table, 2, "C-3"); rtbl_add_column_entry_by_id(table, 0, "A-4"); rtbl_new_row(table); rtbl_add_column_entry_by_id(table, 1, "B-4"); rtbl_new_row(table); rtbl_add_column_entry_by_id(table, 2, "C-4"); rtbl_new_row(table); rtbl_format(table, stdout); rtbl_destroy(table); return 0; } will output the following: Column A Column B Column C A-1 B-1 C-1 A-2 B-2 C-2 A-3 B-3 C-3 A-4 B-4 C-4
HEIMDAL June 26, 2004 HEIMDAL
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