40 lines
822 B
C
40 lines
822 B
C
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#include<stdio.h>
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#include<stdlib.h>
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#include<fcntl.h>
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#include<unistd.h>
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#include<string.h>
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int main(int argc, char* argv[]) {
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int fird,ent,ents;
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off_t i;
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char tst[256];
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size_t n=1,m=1;
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memset(tst,0,256);
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if(argc!=3){
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printf("erreur : %s <Nom Fichier> <offset>\n",argv[0]);
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exit(-1);
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}
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fird=open(argv[1],O_CREAT|O_RDONLY,0600);
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if(fird==-1){
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perror("On ne peut pas ouvrir cela en O_WRONLY");
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exit(1);
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}
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ent = strtol(argv[2],NULL,10);
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lseek(fird,ent*4,SEEK_SET);
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i=read(fird,&ents,4);
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if(i==0){
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printf("Offset is out of range!\n");
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exit(1);
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}
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printf("The number at offset %d is 0x%08x --> %d\n",ent,ents,ents);
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close(fird);
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return EXIT_SUCCESS;
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}
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