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S_UNIX.C
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C/C++ Source or Header
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1990-12-17
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99 lines
/* This file contains system-specific functions for generic UNIX.
* The program pfdisk.c calls these routines.
*/
#include <stdio.h>
#include <fcntl.h>
#define extern
#include "sysdep.h"
#undef extern
int usage(prog) /* print a usage message */
char *prog; /* program name */
{
fprintf(stderr,"Usage: %s dev\n\
\twhere 'dev' is the device name, i.e. /dev/hd0\n\
\t(The device must start on absolute sector zero.)\n",prog);
}
void getGeometry(dev, c, h, s)
char *dev; /* device name */
unsigned *c,*h,*s; /* cyls, heads, sectors */
{
fprintf(stderr,
"\n\tWarning: The device \"%s\" is assumed to have:\n\
\tcyls=%d, heads=%d, sectors=%d (an arbitrary guess).\n",
dev, *c, *h, *s);
fprintf(stderr,
"\n\tThis program was compiled for generic UNIX and therefore\n\
\tdoes not know how to determine the disk parameters. You must\n\
\tdescribe the disk geometry manually, using the 'G' command.\n");
}
int getFile(name, buf, len) /* read file into buffer */
char *name, *buf;
int len;
{ /* (open, read, close) */
int devfd, retval;
devfd = open(name, O_RDONLY, 0);
if (devfd < 0) {
fprintf(stderr,"%s: can't open for reading\n", name);
return(devfd);
}
retval = read(devfd, buf, len);
if (retval < 0)
fprintf(stderr,"%s: read failed\n", name);
close(devfd);
return(retval);
}
int putFile(name, buf, len) /* write buffer to file */
char *name, *buf;
int len;
{ /* (open, write, close) */
int devfd, retval;
devfd = open(name, O_WRONLY|O_CREAT, 0666);
if (devfd < 0) {
fprintf(stderr,"%s: can't open for writing\n", name);
return(devfd);
}
retval = write(devfd, buf, len);
if (retval < 0)
fprintf(stderr,"%s: write failed\n", name);
close(devfd);
return(retval);
}
int getBBlk(devname, buffer) /* read block into buffer */
char *devname, *buffer; /* (open, read, close) */
{
int devfd, retval;
devfd = open(devname,O_RDONLY);
if (devfd < 0) {
printf("%s: can't open for read\n", devname);
return(devfd);
}
retval = read(devfd, buffer, SECSIZE);
close(devfd);
return(retval);
}
int putBBlk(devname, buffer) /* write buffer to device */
char *devname, *buffer; /* (open, write, close) */
{
int devfd, retval;
devfd = open(devname,O_WRONLY);
if (devfd < 0) {
printf("%s: can't open for write\n",devname);
return(devfd);
}
retval = write(devfd, buffer, SECSIZE);
sync();
close(devfd);
return(retval);
}