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| (Empty) |
| 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 } | |
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