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60 lines
1.3 KiB
60 lines
1.3 KiB
#include <stdio.h>
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#include "dbg.h"
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#define MAX_FILENAME 2048
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int main(int argc, char *argv[])
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{
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int rc = -1;
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char *filename;
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int nchars = 0;
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int nlines = 0;
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int i;
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long seekpos;
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char c;
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FILE *fp;
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check(argc > 1, "You must provide a filename as arg 1");
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filename = argv[1];
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fp = fopen(filename, "r");
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check(fp != NULL, "Failed to open \"%s\".", filename);
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while((c = fgetc(fp)) != EOF) {
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nchars++;
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if (c == '\n') {
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nlines++;
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if (nlines % 10 == 0) {
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printf("At line %d of \"%s\"\n", nlines, filename);
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}
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}
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}
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printf("\"%s\" contains %d chars\n", filename, nchars);
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printf("Current position of \"%s\" is %ld\n", filename, ftell(fp));
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printf("Writing out \"%s\" in reverse:\n", filename);
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for (i = 0; i < nchars; i++) {
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seekpos = (long)nchars - (i + 1);
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rc = fseek(fp, seekpos, SEEK_SET);
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check(rc != -1, "Failed to seek to %ld", seekpos);
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c = fgetc(fp);
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check(c != EOF, "Failed to read char at %ld", seekpos);
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putc(c, stdout);
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}
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rewind(fp);
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printf("\n\nRewound \"%s\" to position %ld\n", filename, ftell(fp));
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rc = fclose(fp);
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check(rc != -1, "Failed to close \"%s\".", filename);
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return 1;
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error:
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return 0;
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}
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