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/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
*/
#include <stdio.h>
/*
* MEDIT -- Replace all occurrences of the given string in a file by a
* different string of the same length. Works for binary files as well
* as text files. This is a crude but effective way of editing the symbol
* table of object files, without having to know the data structures.
* (String *data* will be edited too).
*/
/* Solaris used to need this but it doesn't any longer.
#define bcopy(a,b,n) memmove(b,a,n) */
#define BUFLEN 16384
static char buf[BUFLEN];
static int nbytes;
main (argc, argv)
int argc;
char *argv[];
{
register char *ip, *itop, ch;
char *fname, *oldname, *newname;
int fd, nch, total, nmatch, i;
if (argc < 4) {
fprintf (stderr, "Usage: medit file oldname newname\n");
exit (1);
}
fname = argv[1];
if ((fd = open (fname, 2)) == -1) {
fprintf (stderr, "Cannot open %s\n", fname);
exit (2);
}
if ((nbytes = read (fd, buf, BUFLEN)) <= 0) {
fprintf (stderr, "Cannot read %s\n", fname);
exit (2);
}
for (i=2, total=0; i+1 < argc; i=i+2, total+=nmatch) {
oldname = argv[i];
newname = argv[i+1];
if (strlen(oldname) != strlen(newname)) {
fprintf (stderr,
"Replacement string must be same length as the original\n");
exit (3);
}
ch = oldname[0];
nch = strlen (oldname);
itop = buf + nbytes - nch;
for (ip=buf, nmatch=0; ip < itop; ip++)
if (*ip == ch && (strncmp (ip, oldname, nch) == 0)) {
bcopy (newname, ip, nch);
ip = ip + nch - 1;
nmatch++;
}
printf ("%s, %s -> %s: %d entries edited\n",
fname, oldname, newname, nmatch);
}
if (total) {
lseek (fd, 0L, 0);
write (fd, buf, nbytes);
}
close (fd);
exit (0);
}
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