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cc65/testcode/lib/seek.c
cuz 4305e05549 lseek is now in unistd.h
git-svn-id: svn://svn.cc65.org/cc65/trunk@3495 b7a2c559-68d2-44c3-8de9-860c34a00d81
2005-05-04 10:09:52 +00:00

180 lines
4.0 KiB
C

/*
* seek test program
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
int main(int argc, char **argv)
{
char *filename,*x;
char buf[20];
FILE *file;
long pos;
off_t fsz;
int fd;
if (argc <= 1) {
printf("\nfilename: ");
x = fgets(buf,19,stdin);
printf("\n");
if (!x) {
return(0);
}
filename = x;
}
else {
filename = *(argv+1);
}
file = fopen(filename,"rb");
if (!file) {
fprintf(stderr,"cannot open %s: %s\n",filename,strerror(errno));
return(1);
}
if (fread(buf, 10, 1, file) != 1) {
fprintf(stderr,"short read, aborted\n");
fclose(file);
return(1);
}
pos = ftell(file);
if (pos == -1) {
fprintf(stderr,"ftell returned -1: %s\n", strerror(errno));
fclose(file);
return(1);
}
printf("reading 10 bytes from file\n");
printf("current file pos: %ld\n", pos);
printf("get file size (lseek): ");
fd = *(char *)file; /* kids, don't do this at home */
fsz = lseek(fd, 0, SEEK_END);
if (fsz == -1) {
fprintf(stderr,"lseek returned -1: %s\n", strerror(errno));
fclose(file);
return(1);
}
printf("%ld (fd = %d)\n", (long)fsz, fd);
printf("get file size (fseek): ");
pos = fseek(file, 0, SEEK_END);
if (pos != 0) {
fprintf(stderr,"fseek returned -1: %s\n", strerror(errno));
fclose(file);
return(1);
}
pos = ftell(file);
if (pos == -1) {
fprintf(stderr,"ftell returned -1: %s\n", strerror(errno));
fclose(file);
return(1);
}
printf("%ld\n",pos);
printf("positioning at offset 100: ");
pos = fseek(file, 100, SEEK_SET);
if (pos != 0) {
fprintf(stderr,"fseek returned -1: %s\n", strerror(errno));
fclose(file);
return(1);
}
pos = ftell(file);
if (pos == -1) {
fprintf(stderr,"ftell returned -1: %s\n", strerror(errno));
fclose(file);
return(1);
}
if (pos == 100) {
printf("Ok\n");
}
else {
printf("failed! cur pos = %ld\n",pos);
fclose(file);
return(1);
}
printf("seeking back 44 bytes: ");
pos = fseek(file, -44, SEEK_CUR);
if (pos != 0) {
fprintf(stderr,"fseek returned -1: %s\n", strerror(errno));
fclose(file);
return(1);
}
pos = ftell(file);
if (pos == -1) {
fprintf(stderr,"ftell returned -1: %s\n", strerror(errno));
fclose(file);
return(1);
}
if (pos == 56) {
printf("Ok\n");
}
else {
printf("failed! cur pos = %ld\n",pos);
fclose(file);
return(1);
}
printf("seeking forward 111 bytes: ");
pos = fseek(file, 111, SEEK_CUR);
if (pos != 0) {
fprintf(stderr,"fseek returned -1: %s\n", strerror(errno));
fclose(file);
return(1);
}
pos = ftell(file);
if (pos == -1) {
fprintf(stderr,"ftell returned -1: %s\n", strerror(errno));
fclose(file);
return(1);
}
if (pos == 167) {
printf("Ok\n");
}
else {
printf("failed! cur pos = %ld\n",pos);
fclose(file);
return(1);
}
printf("seeking 13 bytes before eof: ");
pos = fseek(file, -13, SEEK_END);
if (pos != 0) {
fprintf(stderr,"fseek returned -1: %s\n", strerror(errno));
fclose(file);
return(1);
}
pos = ftell(file);
if (pos == -1) {
fprintf(stderr,"ftell returned -1: %s\n", strerror(errno));
fclose(file);
return(1);
}
if (pos == fsz - 13) {
printf("Ok\n");
}
else {
printf("failed! cur pos = %ld\n",pos);
fclose(file);
return(1);
}
printf("seeking before sof:\n\t");
pos = fseek(file, -fsz, SEEK_CUR);
if (pos != 0) {
printf("Ok, error %s\n", strerror(errno));
}
else {
printf("NOT OK, no error\n");
}
fclose(file);
return(0);
}