src/mkindx.c

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/*
 * mkindx.c -- make help/news file indexes 
 */

#include "copyright.h"
#include "config.h"

#define MKINDX
#include "help.h"

char line[LINE_SIZE];
int main(int argc, char *argv[])
{
        long pos;
        int i, n, lineno, ntopics;
        char *s, *topic;
        help_indx entry;
        FILE *rfp, *wfp;

        if(argc < 2 || argc > 3) {
                printf
                        ("Usage:\tmkindx <file_to_be_indexed> <output_index_filename>\n");
                exit(-1);
        }
        if((rfp = fopen(argv[1], "r")) == NULL) {
                fprintf(stderr, "can't open %s for reading\n", argv[1]);
                exit(-1);
        }
        if((wfp = fopen(argv[2], "w")) == NULL) {
                fprintf(stderr, "can't open %s for writing\n", argv[2]);
                exit(-1);
        }
        pos = 0L;
        lineno = 0;
        ntopics = 0;
        while (fgets(line, LINE_SIZE, rfp) != NULL) {
                ++lineno;

                n = strlen(line);
                if(line[n - 1] != '\n') {
                        fprintf(stderr, "line %d: line too long\n", lineno);
                }
                if(line[0] == '&') {
                        ++ntopics;

                        if(ntopics > 1) {
                                entry.len = (int) (pos - entry.pos);
                                if(fwrite(&entry, sizeof(help_indx), 1, wfp) < 1) {
                                        fprintf(stderr, "error writing %s\n", argv[2]);
                                        exit(-1);
                                }
                        }
                        for(topic = &line[1];
                                (*topic == ' ' || *topic == '\t') && *topic != '\0'; topic++);
                        for(i = -1, s = topic; *s != '\n' && *s != '\0'; s++) {
                                if(i >= TOPIC_NAME_LEN - 1)
                                        break;
                                if(*s != ' ' || entry.topic[i] != ' ')
                                        entry.topic[++i] = *s;
                        }
                        entry.topic[++i] = '\0';
                        entry.pos = pos + (long) n;
                }
                pos += n;
        }
        entry.len = (int) (pos - entry.pos);
        if(fwrite(&entry, sizeof(help_indx), 1, wfp) < 1) {
                fprintf(stderr, "error writing %s\n", argv[2]);
                exit(-1);
        }
        fclose(rfp);
        fclose(wfp);

        printf("%d topics indexed\n", ntopics);
        exit(0);
}

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