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-rw-r--r--toys/posix/cut.c368
1 files changed, 140 insertions, 228 deletions
diff --git a/toys/posix/cut.c b/toys/posix/cut.c
index 2cb3ef19..f43d3e90 100644
--- a/toys/posix/cut.c
+++ b/toys/posix/cut.c
@@ -1,276 +1,188 @@
-/* cut.c - Cut from a file.
+/* cut.c - print selected ranges from a file
*
- * Copyright 2012 Ranjan Kumar <ranjankumar.bth@gmail.com>
- * Copyright 2012 Kyungwan Han <asura321@gmail.com>
+ * Copyright 2016 Rob Landley <rob@landley.net>
*
* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/cut.html
*
- * TODO: cleanup
+ * Deviations from posix: added -DF. We can only accept 512 selections, and
+ * "-" counts as start to end. Using spaces to separate a comma-separated list
+ * is silly and inconsistent with dd, ps, cp, and mount.
+ *
+ * todo: -n, -s with -c
-USE_CUT(NEWTOY(cut, "b:|c:|f:|d:sn[!cbf]", TOYFLAG_USR|TOYFLAG_BIN))
+USE_CUT(NEWTOY(cut, "b*|c*|f*|F*|O(output-delimiter):d:sDn[!cbf]", TOYFLAG_USR|TOYFLAG_BIN))
config CUT
bool "cut"
default y
help
- usage: cut OPTION... [FILE]...
+ usage: cut [-Ds] [-bcfF LIST] [-dO DELIM] [FILE...]
Print selected parts of lines from each FILE to standard output.
- -b LIST select only these bytes from LIST
- -c LIST select only these characters from LIST
- -f LIST select only these fields
- -d DELIM use DELIM instead of TAB for field delimiter
- -s do not print lines not containing delimiters
- -n don't split multibyte characters (ignored)
+ Each selection LIST is comma separated, either numbers (counting from 1)
+ or dash separated ranges (inclusive, with X- meaning to end of line and -X
+ from start). By default selection ranges are sorted and collated, use -D
+ to prevent that.
+
+ -b select bytes
+ -c select UTF-8 characters
+ -d use DELIM (default is TAB for -f, run of whitespace for -F)
+ -D Don't sort/collate selections
+ -f select fields (words) separated by single DELIM character
+ -F select fields separated by DELIM regex
+ -O output delimiter (default one space for -F, input delim for -f)
+ -s skip lines without delimiters
*/
#define FOR_cut
#include "toys.h"
GLOBALS(
- char *delim;
- char *flist;
- char *clist;
- char *blist;
+ char *d;
+ char *O;
+ struct arg_list *select[4]; // we treat them the same, so loop through
- void *slist_head;
- unsigned nelem;
- void (*do_cut)(int fd);
+ int pairs;
+ regex_t reg;
)
-struct slist {
- struct slist *next;
- int start, end;
-};
-
-static void add_to_list(int start, int end)
-{
- struct slist *current, *head_ref, *temp1_node;
-
- head_ref = TT.slist_head;
- temp1_node = xzalloc(sizeof(struct slist));
- temp1_node->start = start;
- temp1_node->end = end;
-
- /* Special case for the head end */
- if (!head_ref || head_ref->start >= start) {
- temp1_node->next = head_ref;
- head_ref = temp1_node;
- } else {
- /* Locate the node before the point of insertion */
- current = head_ref;
- while (current->next && current->next->start < temp1_node->start)
- current = current->next;
- temp1_node->next = current->next;
- current->next = temp1_node;
- }
- TT.slist_head = head_ref;
-}
-
-// parse list and add to slist.
-static void parse_list(char *list)
+// Apply selections to an input line, producing output
+static void cut_line(char **pline, long len)
{
- for (;;) {
- char *ctoken = strsep(&list, ","), *dtoken;
- int start = 0, end = INT_MAX;
-
- if (!ctoken) break;
- if (!*ctoken) continue;
-
- // Get start position.
- if (*(dtoken = strsep(&ctoken, "-"))) {
- start = atolx_range(dtoken, 0, INT_MAX);
- start = (start?(start-1):start);
- }
-
- // Get end position.
- if (!ctoken) end = -1; //case e.g. 1,2,3
- else if (*ctoken) {//case e.g. N-M
- end = atolx_range(ctoken, 0, INT_MAX);
- if (!end) end = INT_MAX;
- end--;
- if(end == start) end = -1;
- }
- add_to_list(start, end);
- TT.nelem++;
- }
- // if list is missing in command line.
- if (!TT.nelem) error_exit("missing positions list");
-}
-
-/*
- * retrive data from the file/s.
- */
-static void get_data(void)
-{
- char **argv = toys.optargs; //file name.
- toys.exitval = EXIT_SUCCESS;
-
- if(!*argv) TT.do_cut(0); //for stdin
- else {
- for(; *argv; ++argv) {
- if(strcmp(*argv, "-") == 0) TT.do_cut(0); //for stdin
- else {
- int fd = open(*argv, O_RDONLY, 0);
- if (fd < 0) {//if file not present then continue with other files.
- perror_msg_raw(*argv);
- continue;
+ unsigned *pairs = (void *)toybuf;
+ char *line = *pline;
+ int i, j;
+
+ if (len && line[len-1]=='\n') line[--len] = 0;
+
+ // Loop through selections
+ for (i=0; i<TT.pairs; i++) {
+ unsigned start = pairs[2*i], end = pairs[(2*i)+1], count;
+ char *s = line, *ss;
+
+ if (start) start--;
+ if (start>=len) continue;
+ if (!end || end>len) end = len;
+ count = end-start;
+
+ // Find start and end of output string for the relevant selection type
+ if (toys.optflags&FLAG_b) s += start;
+ else if (toys.optflags&FLAG_c) {
+ if (start) crunch_str(&s, start, 0, 0, 0);
+ if (!*s) continue;
+ start = s-line;
+ ss = s;
+ crunch_str(&ss, count, 0, 0, 0);
+ count = ss-s;
+ } else {
+ regmatch_t match;
+
+ // Loop through skipping appropriate number of fields
+ for (j = 0; j<2; j++) {
+ ss = s;
+ if (j) start = count;
+ while (*ss && start) {
+ if (toys.optflags&FLAG_f) {
+ if (strchr(TT.d, *ss++)) start--;
+ } else {
+ if (regexec(&TT.reg, ss, 1, &match, REG_NOTBOL|REG_NOTEOL)) {
+ ss = line+len;
+ continue;
+ }
+ if (!match.rm_eo) return;
+ ss += (!--start && j) ? match.rm_so : match.rm_eo;
+ }
}
- TT.do_cut(fd);
- xclose(fd);
+ // did start run us off the end, so nothing to print?
+ if (!j) if (!*(s = ss)) break;
}
+ if (!*s) continue;
+ count = ss-s;
}
+ if (i && TT.O) fputs(TT.O, stdout);
+ fwrite(s, count, 1, stdout);
}
+ xputc('\n');
}
-// perform cut operation on the given delimiter.
-static void do_fcut(int fd)
+static int compar(unsigned *a, unsigned *b)
{
- char *buff, *pfield = 0, *delimiter = TT.delim;
-
- for (;;) {
- unsigned cpos = 0;
- int start, ndelimiters = -1;
- int nprinted_fields = 0;
- struct slist *temp_node = TT.slist_head;
-
- free(pfield);
- pfield = 0;
+ if (*a<*b) return -1;
+ if (*a>*b) return 1;
+ if (a[1]<b[1]) return -1;
+ if (a[1]>b[1]) return 1;
- if (!(buff = get_line(fd))) break;
-
- //does line have any delimiter?.
- if (strrchr(buff, (int)delimiter[0]) == NULL) {
- //if not then print whole line and move to next line.
- if (!(toys.optflags & FLAG_s)) xputs(buff);
- continue;
- }
-
- pfield = xzalloc(strlen(buff) + 1);
-
- if (temp_node) {
- //process list on each line.
- while (cpos < TT.nelem && buff) {
- if (!temp_node) break;
- start = temp_node->start;
- do {
- char *field = 0;
-
- //count number of delimeters per line.
- while (buff) {
- if (ndelimiters < start) {
- ndelimiters++;
- field = strsep(&buff, delimiter);
- } else break;
- }
- //print field (if not yet printed).
- if (!pfield[ndelimiters]) {
- if (ndelimiters == start) {
- //put delimiter.
- if (nprinted_fields++ > 0) xputc(delimiter[0]);
- if (field) fputs(field, stdout);
- //make sure this field won't print again.
- pfield[ndelimiters] = (char) 0x23; //put some char at this position.
- }
- }
- start++;
- if ((temp_node->end < 0) || !buff) break;
- } while(start <= temp_node->end);
- temp_node = temp_node->next;
- cpos++;
- }
- }
- xputc('\n');
- }
+ return 0;
}
-// perform cut operation char or byte.
-static void do_bccut(int fd)
+// parse A or A-B or A- or -B
+static char *get_range(void *data, char *str, int len)
{
- char *buff;
+ char *end = str;
+ unsigned *pairs = (void *)toybuf, i;
- while ((buff = get_line(fd)) != NULL) {
- unsigned cpos = 0;
- int buffln = strlen(buff);
- char *pfield = xzalloc(buffln + 1);
- struct slist *temp_node = TT.slist_head;
+ // Using toybuf[] to store ranges means we can have 512 selections max.
+ if (TT.pairs == sizeof(toybuf)/sizeof(int)) perror_exit("select limit");
+ pairs += 2*TT.pairs++;
- if (temp_node != NULL) {
- while (cpos < TT.nelem) {
- int start;
+ pairs[1] = UINT_MAX;
+ for (i = 0; ;i++) {
+ if (i==2) return end;
+ if (isdigit(*end)) {
+ long long ll = estrtol(end, &end, 10);
- if (!temp_node) break;
- start = temp_node->start;
- while (start < buffln) {
- //to avoid duplicate field printing.
- if (pfield[start]) {
- if (++start <= temp_node->end) continue;
- temp_node = temp_node->next;
- break;
- } else {
- //make sure this field won't print again.
- pfield[start] = (char) 0x23; //put some char at this position.
- xputc(buff[start]);
- }
- if (++start > temp_node->end) {
- temp_node = temp_node->next;
- break;
- }
- }
- cpos++;
- }
- xputc('\n');
+ if (ll<1 || ll>UINT_MAX || errno) return end;
+ pairs[i] = ll;
}
- free(pfield);
- pfield = NULL;
+ if (*end++ != '-') break;
}
+ if (!i) pairs[1] = pairs[0];
+ if ((end-str)<len) return end;
+ if (pairs[0]>pairs[1]) return str;
+
+ // No error
+ return 0;
}
void cut_main(void)
{
- char delimiter = '\t'; //default delimiter.
- char *list;
-
- TT.nelem = 0;
- TT.slist_head = NULL;
-
- //Get list and assign the function.
- if (toys.optflags & FLAG_f) {
- list = TT.flist;
- TT.do_cut = do_fcut;
- } else if (toys.optflags & FLAG_c) {
- list = TT.clist;
- TT.do_cut = do_bccut;
- } else {
- list = TT.blist;
- TT.do_cut = do_bccut;
- }
-
- if (toys.optflags & FLAG_d) {
- //delimiter must be 1 char.
- if(TT.delim[0] && TT.delim[1])
- perror_exit("the delimiter must be a single character");
- delimiter = TT.delim[0];
+ int i;
+ char buf[8];
+
+ // Parse command line arguments
+ if ((toys.optflags&(FLAG_s|FLAG_f|FLAG_F))==FLAG_s)
+ error_exit("-s needs -Ff");
+ if ((toys.optflags&(FLAG_d|FLAG_f|FLAG_F))==FLAG_d)
+ error_exit("-d needs -Ff");
+ if (!TT.d) TT.d = (toys.optflags&FLAG_F) ? "[[:space:]][[:space:]]*" : "\t";
+ if (toys.optflags&FLAG_F) xregcomp(&TT.reg, TT.d, REG_EXTENDED);
+ if (!TT.O) {
+ if (toys.optflags&FLAG_F) TT.O = " ";
+ else if (toys.optflags&FLAG_f) TT.O = TT.d;
}
- if(!(toys.optflags & FLAG_d) && (toys.optflags & FLAG_f)) {
- TT.delim = xzalloc(2);
- TT.delim[0] = delimiter;
+ // Parse ranges, which are attached to a selection type (only one can be set)
+ for (i = 0; i<ARRAY_LEN(TT.select); i++) {
+ sprintf(buf, "bad -%c", "Ffcb"[i]);
+ if (TT.select[i]) comma_args(TT.select[i], 0, buf, get_range);
}
-
- //when field is not specified, cutting has some special handling.
- if (!(toys.optflags & FLAG_f)) {
- if (toys.optflags & FLAG_s)
- perror_exit("suppressing non-delimited lines operating on fields");
- if (delimiter != '\t')
- perror_exit("an input delimiter may be specified only when operating on fields");
+ if (!TT.pairs) error_exit("no selections");
+
+ // Sort and collate selections
+ if (!(toys.optflags&FLAG_D)) {
+ int from, to;
+ unsigned *pairs = (void *)toybuf;
+
+ qsort(toybuf, TT.pairs, 8, (void *)compar);
+ for (to = 0, from = 2; from/2 < TT.pairs; from += 2) {
+ if (pairs[from] > pairs[to+1]) {
+ to += 2;
+ memcpy(pairs+to, pairs+from, 2*sizeof(unsigned));
+ } else if (pairs[from+1] > pairs[to+1]) pairs[to+1] = pairs[from+1];
+ }
+ TT.pairs = (to/2)+1;
}
- parse_list(list);
- get_data();
- if (!(toys.optflags & FLAG_d) && (toys.optflags & FLAG_f)) {
- free(TT.delim);
- TT.delim = NULL;
- }
- llist_traverse(TT.slist_head, free);
+ // For each argument, loop through lines of file and call cut_line() on each
+ loopfiles_lines(toys.optargs, cut_line);
}
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