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#include <err.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/select.h>
#include <sys/wait.h>
#define MAXFILES 100 /* Maximum number of files. */
#define MAXFILE 255 /* Maximum file name length. */
#define MAXLINE MAXFILE+1 /* MAXFILE plus newline. */
extern char *optarg;
extern int optind;
void escape(char *, char **);
void waitstdin(void);
int
main(int argc, char *argv[])
{
char file[30], *name, *froms[MAXFILES], *tmp, *tos[MAXFILES];
FILE *fp;
int c, i, j, s, xflag;
/* Allocate memory. */
for(i = 0; i < MAXFILES; i++)
if(!(froms[i] = malloc(MAXFILE)) || !(tos[i] = malloc(MAXFILE)))
err(1, "malloc");
if(!(tmp = malloc(MAXLINE*4)))
err(1, "malloc");
sprintf(file, "/var/tmp/re.%d", getppid());
/*
* The existence of the temporary file is only checked when there
* is input to be read on standard in, as re(1) doesn't create
* the file until it starts writing on standard out.
*/
if(waitstdin(), access(file, F_OK)){
fprintf(stderr, "%s: %s does not exist\n", argv[0], file);
return 1;
}
/* Read command-line options. */
name = argv[0];
xflag = 0;
while((c = getopt(argc, argv, "x")) != -1)
switch(c){
case 'x':
xflag = 1;
break;
default:
goto usage;
}
argc -= optind;
argv += optind;
if(argc > 0){
usage: fprintf(stderr, "usage: %s [-x]\n", name);
return 1;
}
if(!(fp = fopen(file, "r")))
err(1, "fopen");
/* Read new file names. */
for(j = 0; j < MAXFILES && fgets(tmp, MAXLINE, stdin); j++){
tmp[strcspn(tmp, "\n")] = 0;
strcpy(tos[j], tmp);
}
/* Read original file names. */
for(i = 0; i < MAXFILES && fgets(tmp, MAXLINE, fp); i++){
tmp[strcspn(tmp, "\n")] = 0;
strcpy(froms[i], tmp);
}
if(i != j){
fprintf(stderr, "%s: too %s lines\n",
name, j > i ? "many" : "few");
return 1;
}
/*
* The corresponding mv invocations are printed on standard out.
* If the -x flag is given, they are executed too.
*/
for(i = 0; i < j; i++){
escape(froms[i], &tmp); printf("mv -- '%s'", tmp);
escape(tos[i], &tmp); printf(" '%s'\n", tmp);
if(xflag){
if(!fork()){
execl("/bin/mv", "mv", "--", froms[i], tos[i], NULL);
err(1, "execl");
}
if(wait(&s), s){
fprintf(stderr, "/bin/mv exited with %d\n",
WEXITSTATUS(s));
return 1;
}
}
}
unlink(file);
fclose(fp);
}
void
escape(char *str, char **res)
{
int i, j;
for(i = j = 0; str[i]; i++){
if(str[i] == '\''){
strcat(*res, "'\\''");
j += 4;
} else
(*res)[j++] = str[i];
}
(*res)[j] = 0;
}
void
waitstdin()
{
fd_set readfds;
FD_ZERO(&readfds);
FD_SET(0, &readfds);
if(select(1, &readfds, NULL, NULL, NULL) == -1)
err(1, "select");
}
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