/*This version of xref uses the Text, Array, and MP interfaces,and stores the line numbers in 3-byte MP_Ts in Array_Ts.It's slow, because it expands Array_Ts one element at a time.getword picks off the identifiers right-to-left.*/#include <stdio.h>#include <stdlib.h>#include <string.h>#include <errno.h>#include "assert.h"#include "fmt.h"#include "mem.h"#include "mp.h"#include "table.h"#include "array.h"#include "text.h"static char rcsid[] = "$Id: iref.c,v 1.3 1997/07/30 22:41:04 drh Exp $";Text_T getword(Text_T *line, Text_T first, Text_T rest) {	int i, j;	assert(line);	if ((i = Text_rupto(*line, 1, 0, first)) > 0) {		Text_T word = Text_sub(*line, j = Text_rmany(*line, 1, i + 1, rest), i + 1);		*line = Text_sub(*line, 1, j);		return word;	} else		return Text_null;}Text_T first, rest;int textcmp(const void *x, const void *y) {	return Text_cmp(*(Text_T *)x, *(Text_T *)y);}int compare(const void *x, const void *y) {	return textcmp(*(Text_T **)x, *(Text_T **)y);}unsigned texthash(const void *x) {	int i;	unsigned h = 0;	const Text_T *t = x;	for (i = 0; i < t->len; i++)		h = (h<<1) + t->str[i];	return h;}void print(Table_T files) {	int i;	void **array = Table_toArray(files, NULL);	qsort(array, Table_length(files), 2*sizeof (*array), compare);	for (i = 0; array[i]; i += 2) {		int j;		Text_T *filename = array[i];		if (filename->len > 0)			Fmt_print("\t%T:", filename);		for (j = 0; j < Array_length(array[i+1]); j++)			Fmt_print(" %D", Array_get(array[i+1], j), 10);		Fmt_print("\n");		FREE(filename);		Array_free((Array_T *)&array[i+1]);	}	FREE(array);	Table_free(&files);}Text_T *copy(Text_T t) {	Text_T *p;	NEW(p);	*p = t;	return p;}void iref(char *name, FILE *fp, Table_T identifiers) {	char buf[512];	Text_T filename = { 0, "" };	unsigned char linenum[3];	if (name)		filename = Text_put(name);	MP_fromint(linenum, 1);	while (fgets(buf, sizeof buf, fp) != NULL) {		Text_T id, line = Text_put(buf);		while ((id = getword(&line, first, rest)).len > 0) {			Array_T array;			Table_T files;			files = Table_get(identifiers, &id);			if (files == NULL) {				files = Table_new(0, textcmp, texthash);				Table_put(identifiers, copy(id), files);			}			array = Table_get(files, &filename);			if (array == NULL) {				array = Array_new(1, 3);				Table_put(files, copy(filename), array);				Array_put(array, 0, linenum);			} else if (MP_cmp(Array_get(array, Array_length(array)-1), linenum) != 0) {				Array_resize(array, Array_length(array) + 1);				Array_put(array, Array_length(array) - 1, linenum);			}		}		MP_addi(linenum, linenum, 1);	}}int main(int argc, char *argv[]) {	int i;	Table_T identifiers = Table_new(10000, textcmp, texthash);	Text_save_T mark = Text_save();	Fmt_register('T', Text_fmt);	Fmt_register('D', MP_fmt);	MP_set(24);	first = Text_cat(Text_cat(Text_ucase, Text_lcase), Text_box("_", 1));	rest  = Text_cat(first, Text_digits);	for (i = 1; i < argc; i++) {		FILE *fp = fopen(argv[i], "r");		if (fp == NULL)			fprintf(stderr, "%s: can't open '%s' (%s)\n", argv[0], argv[i], strerror(errno));		else {			iref(argv[i], fp, identifiers);			fclose(fp);		}	}	if (argc == 1)		iref(NULL, stdin, identifiers);	{		int i;		void **array = Table_toArray(identifiers, NULL);		qsort(array, Table_length(identifiers), 2*sizeof (*array), compare);		for (i = 0; array[i]; i += 2) {			Fmt_print("%T", array[i]);			print(array[i+1]);			FREE(array[i]);		}		FREE(array);		Table_free(&identifiers);	}	Text_restore(&mark);	return EXIT_SUCCESS;}