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Annotation of embedaddon/sqlite3/tool/extract.c, revision 1.1

1.1     ! misho       1: /*
        !             2: ** Extract a range of bytes from a file.
        !             3: **
        !             4: ** Usage:
        !             5: **
        !             6: **    extract FILENAME OFFSET AMOUNT
        !             7: **
        !             8: ** The bytes are written to standard output.
        !             9: */
        !            10: #include <stdio.h>
        !            11: #include <stdlib.h>
        !            12: 
        !            13: int main(int argc, char **argv){
        !            14:   FILE *f;
        !            15:   char *zBuf;
        !            16:   int ofst;
        !            17:   int n;
        !            18:   size_t got;
        !            19: 
        !            20:   if( argc!=4 ){
        !            21:     fprintf(stderr, "Usage: %s FILENAME OFFSET AMOUNT\n", *argv);
        !            22:     return 1;
        !            23:   }
        !            24:   f = fopen(argv[1], "rb");
        !            25:   if( f==0 ){
        !            26:     fprintf(stderr, "cannot open \"%s\"\n", argv[1]);
        !            27:     return 1;
        !            28:   }
        !            29:   ofst = atoi(argv[2]);
        !            30:   n = atoi(argv[3]);
        !            31:   zBuf = malloc( n );
        !            32:   if( zBuf==0 ){
        !            33:     fprintf(stderr, "out of memory\n");
        !            34:     return 1;
        !            35:   }
        !            36:   fseek(f, ofst, SEEK_SET);
        !            37:   got = fread(zBuf, 1, n, f);
        !            38:   fclose(f);
        !            39:   if( got<n ){
        !            40:     fprintf(stderr, "got only %d of %d bytes\n", got, n);
        !            41:     return 1;
        !            42:   }else{
        !            43:     fwrite(zBuf, 1, n, stdout);
        !            44:   }
        !            45:   return 0;
        !            46: }