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Hiroshi found another bug. Currently sed's $ triggers at end of every file,

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and with multiple files SuSv3 says it should only trigger at the end of the
LAST file.

The trivial fix I tried first broke if the last file is empty.  Fixing this
properly required restructuring things to create a file list (actually a
FILE * list), and then processing it all in one go.  (There's probably a
smaller way to do this, merging with append_list perhaps.  But let's get
the behavior correct first.)

Note that editing files in place (-i) needs the _old_ behavior, with $
triggering at the end of each file.

Here's a test of all the things this patch fixed.  gnu and busybox seds produce
the same results with this patch, and different without it.

echo -n -e "1one\n1two\n1three" > ../test1
echo -n > ../test2
echo -e "3one\n3two\n3three" > ../test3
sed -n "$ p" ../test1 ../test2 ../test3
sed -n "$ p" ../test1 ../test2
sed -i -n "$ p" ../test1 ../test2 ../test3
This commit is contained in:
Rob Landley 2004-11-25 07:21:47 +00:00
parent a8b98d63e7
commit dcc286607c
1 changed files with 47 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
editors/sed.c
View File

@ -34,7 +34,10 @@
resulting sed_cmd_t structures are appended to a linked list
(sed_cmd_head/sed_cmd_tail).
process_file() does actual sedding, reading data lines from an input FILE *
add_input_file() adds a FILE * to the list of input files. We need to
know them all ahead of time to find the last line for the $ match.
process_files() does actual sedding, reading data lines from each input FILE *
(which could be stdin) and applying the sed command list (sed_cmd_head) to
each of the resulting lines.
@ -116,6 +119,9 @@ static int be_quiet, in_place, regex_type;
FILE *nonstdout;
char *outname,*hold_space;
/* List of input files */
int input_file_count,current_input_file;
FILE **input_file_list;
static const char bad_format_in_subst[] =
"bad format in substitution expression";
@ -171,6 +177,9 @@ static void free_and_close_stuff(void)
}
if(hold_space) free(hold_space);
while(current_input_file<input_file_count)
fclose(input_file_list[current_input_file++]);
}
#endif
@ -565,6 +574,8 @@ void add_cmd(char *cmdstr)
}
}
/* Append to a string, reallocating memory as necessary. */
struct pipeline {
char *buf; /* Space to hold string */
int idx; /* Space used */
@ -718,20 +729,29 @@ static void flush_append(void)
append_head=append_tail=NULL;
}
/* Get next line of input, flushing append buffer and noting if we hit EOF
* without a newline on the last line.
*/
static char *get_next_line(FILE * file, int *no_newline)
void add_input_file(FILE *file)
{
char *temp;
input_file_list=xrealloc(input_file_list,(input_file_count+1)*sizeof(FILE *));
input_file_list[input_file_count++]=file;
}
/* Get next line of input from input_file_list, flushing append buffer and
* noting if we ran out of files without a newline on the last line we read.
*/
static char *get_next_line(int *no_newline)
{
char *temp=NULL;
int len;
flush_append();
temp=bb_get_line_from_file(file);
if(temp) {
len=strlen(temp);
if(len && temp[len-1]=='\n') temp[len-1]=0;
else *no_newline=1;
while(current_input_file<input_file_count) {
temp=bb_get_line_from_file(input_file_list[current_input_file]);
if(temp) {
len=strlen(temp);
*no_newline=!(len && temp[len-1]=='\n');
if(!*no_newline) temp[len-1]=0;
break;
} else fclose(input_file_list[current_input_file++]);
}
return temp;
@ -757,15 +777,15 @@ static int puts_maybe_newline(char *s, FILE *file, int missing_newline, int no_n
#define sed_puts(s,n) missing_newline=puts_maybe_newline(s,nonstdout,missing_newline,n)
static void process_file(FILE *file)
static void process_files(void)
{
char *pattern_space, *next_line;
static int linenum = 0, missing_newline=0;
int linenum = 0, missing_newline=0;
int no_newline,next_no_newline=0;
next_line = get_next_line(file,&next_no_newline);
next_line = get_next_line(&next_no_newline);
/* go through every line in the file */
/* go through every line in each file */
for(;;) {
sed_cmd_t *sed_cmd;
int substituted=0;
@ -775,7 +795,7 @@ static void process_file(FILE *file)
no_newline=next_no_newline;
/* Read one line in advance so we can act on the last line, the '$' address */
next_line = get_next_line(file,&next_no_newline);
next_line = get_next_line(&next_no_newline);
linenum++;
restart:
/* for every line, go through all the commands */
@ -944,7 +964,7 @@ restart:
free(pattern_space);
pattern_space = next_line;
no_newline=next_no_newline;
next_line = get_next_line(file,&next_no_newline);
next_line = get_next_line(&next_no_newline);
linenum++;
break;
}
@ -974,7 +994,7 @@ restart:
pattern_space[len]='\n';
strcpy(pattern_space+len+1, next_line);
no_newline=next_no_newline;
next_line = get_next_line(file,&next_no_newline);
next_line = get_next_line(&next_no_newline);
linenum++;
}
break;
@ -1150,8 +1170,7 @@ extern int sed_main(int argc, char **argv)
}
}
/* if we didn't get a pattern from a -e and no command file was specified,
* argv[optind] should be the pattern. no pattern, no worky */
/* if we didn't get a pattern from -e or -f, use argv[optind] */
if(getpat) {
if (argv[optind] == NULL)
bb_show_usage();
@ -1172,14 +1191,16 @@ extern int sed_main(int argc, char **argv)
fprintf(stderr,"sed: Filename required for -i\n");
exit(1);
}
process_file(stdin);
add_input_file(stdin);
process_files();
} else {
int i;
FILE *file;
for (i = optind; i < argc; i++) {
if(!strcmp(argv[i], "-") && !in_place) {
process_file(stdin);
add_input_file(stdin);
process_files();
} else {
file = bb_wfopen(argv[i], "r");
if (file) {
@ -1187,30 +1208,27 @@ extern int sed_main(int argc, char **argv)
struct stat statbuf;
outname=bb_xstrndup(argv[i],strlen(argv[i])+6);
strcat(outname,"XXXXXX");
/* Set permissions of output file */
fstat(fileno(file),&statbuf);
mkstemp(outname);
nonstdout=bb_wfopen(outname,"w");
/* Set permissions of output file */
fstat(fileno(file),&statbuf);
fchmod(fileno(nonstdout),statbuf.st_mode);
atexit(cleanup_outname);
}
process_file(file);
fclose(file);
if(in_place) {
add_input_file(file);
process_files();
fclose(nonstdout);
nonstdout=stdout;
unlink(argv[i]);
rename(outname,argv[i]);
free(outname);
outname=0;
}
} else add_input_file(file);
} else {
status = EXIT_FAILURE;
}
}
}
if(input_file_count>current_input_file) process_files();
}
return status;