source: trunk/athena/bin/cxref/fmtxref.c @ 13596

/*
** fmtxref.c
**
** format the output of the C cross referencer.
** this program relies on the fact that its input
** is sorted and uniq-ed.
**
** Arnold Robbins, Information and Computer Science, Georgia Tech
**      gatech!arnold
** Copyright (c) 1984 by Arnold Robbins.
** All rights reserved.
** This program may not be sold, but may be distributed
** provided this header is included.
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <libgen.h>

#define TRUE    1
#define FALSE   0

#define MAXID   121     /* maximum lengths of identifiers, file names, etc. */
#define MAXFILE 15
#define MAXLINE 121
#define MAXNUM  7

#define ID      1       /* return codes to indicate what is new on input line */
#define NEWFILE 2
#define LINE    3
#define ERROR   4

#define WIDTH   80      /* default line output width */

int width = WIDTH;

char prev_id[MAXID] = "";
char prev_file[MAXFILE] = "";

char id[MAXID] = "";
char file[MAXFILE] = "";
char line[MAXNUM] = "";

char *name;

static int breakup(char *text);
static void output(int val);
static void usage(void);

int main(int argc, char **argv)
{
        char in_line[BUFSIZ];
        int val;

        name = basename(argv[0]);

        /*
         * since this program is ONLY called by the cxref driver,
         * we know that it will be called "fmtxref -w width"
         * so we don't have to do complicated argument parsing.
         * we also know that cxref makes sure we get a valid width.
         */

        if (argc > 1) {
                if (argc == 3) {
                        if (strcmp(argv[1], "-w") == 0)
                                width = atoi(argv[2]);
                        else
                                usage();
                } else
                        usage();
        }
        /* else
                use default width */

        if(fgets(in_line, sizeof(in_line), stdin) == NULL)
        {
                fprintf(stderr, "%s: standard input is empty.\n", name);
                exit(1);
        }

        if((val = breakup(in_line)) == ERROR)
        {
                fprintf(stderr, "%s: malformed input '%s'\n", name, in_line);
                exit(2);
        }

        output(val);            /* does proper formatting */

        while(fgets(in_line, sizeof(in_line), stdin) != NULL && val != ERROR)
        {
                val = breakup(in_line);
                output(val);
        }

        if(val == ERROR)
        {
                fprintf(stderr, "%s: malformed input '%s'\n", name, in_line);
                exit(2);
        }

        putchar('\n');
        return(0);
}

static int breakup(char *text)
{
        int retval;
        int i, j;

        if(text[0] == '"' || text[0] == '\'')
        {
                /* quoted stuff, break the line up by hand */

                i = 0;
                id[i++] = text[0];

                for(j = 1; text[j] != text[0]; i++, j++)
                {
                        id[i] = text[j];
                        if(id[i] == '\\')
                                id[++i] = text[++j];    /* e.g. \" */
                }
                id[i++] = text[0];
                id[i] = '\0';
                j++;    /* skip close quote */

                while(isspace((int)text[j]))
                        j++;
                
                for(i = 0; !isspace((int)text[j]); i++, j++)
                        file[i] = text[j];
                file[i] = '\0';


                while(isspace((int)text[j]))
                        j++;

                for(i = 0; !isspace((int)text[j]) && text[j] != '\0'; i++, j++)
                        line[i] = text[j];
                line[i] = '\0';
        }
        else
        {
                if(sscanf(text, "%s %s %s", id, file, line) != 3)
                        return(ERROR);
        }

        /* now decide about return code for formatting */

        if(strcmp(prev_id, id) != 0)    /* different identifiers */
        {
                strcpy(prev_id, id);
                strcpy(prev_file, file);
                retval = ID;
        }
        else if(strcmp(prev_file, file) != 0)   /* different files */
        {
                strcpy(prev_file, file);
                retval = NEWFILE;
        }
        else
                retval = LINE;

        return(retval);
}

static void output(int val)
{
        static int curpos = 1;
        static int first = TRUE;
        int line_len = strlen(line);

        switch(val) {
        case ID:
                if(! first)
                        putchar('\n');  /* finish off last line of prev id */
                else
                        first = FALSE;

                printf("%-20.20s\t%-14.14s\t%s", id, file, line);
                curpos = 40 + line_len;
                break;

        case NEWFILE:
                printf("\n\t\t\t%-14.14s\t%s", file, line);
                curpos = 40 + line_len;
                break;

        case LINE:
                if(curpos + line_len + 2 < width)
                {
                        printf(", %s", line);   /* same output line */
                        curpos += 2 + line_len;
                }
                else
                {
                        printf(",\n\t\t\t\t\t%s", line);        /* new line */
                        curpos = 40 + line_len;
                }
                break;

        case ERROR:
                /* shouldn't come to here */
                fprintf(stderr, "%s: internal error: output() called with %s\n",
                        name, "a value of ERROR");
                fprintf(stderr, "%s: id == '%s'\tfile == '%s'\tline == '%s'\n",
                        name, id, file, line);
                break;

        default:
                /* shouldn't come to here either */
                fprintf(stderr, "%s: internal error: output() called with %s %d\n",
                        name, "the unknown value", val);
                fprintf(stderr, "%s: id == '%s'\tfile == '%s'\tline == '%s'\n",
                        name, id, file, line);
                break;
        }
}

static void usage(void)
{
        fprintf(stderr, "usage: %s [-w width]\n", basename(name));
        exit (1);
}