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- /* join - join lines of two files on a common field
- Copyright (C) 1991 Free Software Foundation, Inc.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- Written by Mike Haertel, mike@gnu.ai.mit.edu. */
-
- #define _GNU_SOURCE
- #include <ctype.h>
- #ifndef isblank
- #define isblank(c) ((c) == ' ' || (c) == '\t')
- #endif
- #include <stdio.h>
- #include <sys/types.h>
- #include <getopt.h>
- #include "system.h"
-
- #ifdef isascii
- #define ISSPACE(c) (isascii(c) && isspace(c))
- #define ISDIGIT(c) (isascii(c) && isdigit(c))
- #else
- #define ISSPACE(c) isspace(c)
- #define ISDIGIT(c) isdigit(c)
- #endif
-
- char *xmalloc ();
- char *xrealloc ();
- void error ();
- static void usage ();
-
- #define min(A, B) ((A) < (B) ? (A) : (B))
-
- /* An element of the list describing the format of each
- output line. */
- struct outlist
- {
- int file; /* File to take field from (1 or 2). */
- int field; /* Field number to print. */
- struct outlist *next;
- };
-
- /* A field of a line. */
- struct field
- {
- char *beg; /* First character in field. */
- char *lim; /* Character after last character in field. */
- };
-
- /* A line read from an input file. Newlines are not stored. */
- struct line
- {
- char *beg; /* First character in line. */
- char *lim; /* Character after last character in line. */
- int nfields; /* Number of elements in `fields'. */
- struct field *fields;
- };
-
- /* One or more consecutive lines read from a file that all have the
- same join field value. */
- struct seq
- {
- int count; /* Elements used in `lines'. */
- int alloc; /* Elements allocated in `lines'. */
- struct line *lines;
- };
-
- /* If nonzero, print unpairable lines in file 1 or 2. */
- static int print_unpairables_1, print_unpairables_2;
-
- /* If nonzero, print pairable lines. */
- static int print_pairables;
-
- /* Empty output field filler. */
- static char *empty_filler;
-
- /* Field to join on. */
- static int join_field_1, join_field_2;
-
- /* List of fields to print. */
- struct outlist *outlist;
-
- /* Last element in `outlist', where a new element can be added. */
- struct outlist *outlist_end;
-
- /* Tab character separating fields; if this is NUL fields are separated
- by any nonempty string of white space, otherwise by exactly one
- tab character. */
- static char tab;
-
- /* The name this program was run with. */
- char *program_name;
-
- /* Fill in the `fields' structure in LINE. */
-
- static void
- xfields (line)
- struct line *line;
- {
- static int nfields = 2;
- int i;
- register char *ptr, *lim;
-
- line->fields = (struct field *) xmalloc (nfields * sizeof (struct field));
-
- ptr = line->beg;
- lim = line->lim;
-
- for (i = 0; ptr < lim; ++i)
- {
- if (i == nfields)
- {
- nfields *= 2;
- line->fields = (struct field *)
- xrealloc ((char *) line->fields, nfields * sizeof (struct field));
- }
- if (tab)
- {
- line->fields[i].beg = ptr;
- while (ptr < lim && *ptr != tab)
- ++ptr;
- line->fields[i].lim = ptr;
- if (ptr < lim)
- ++ptr;
- }
- else
- {
- line->fields[i].beg = ptr;
- while (ptr < lim && !ISSPACE (*ptr))
- ++ptr;
- line->fields[i].lim = ptr;
- while (ptr < lim && ISSPACE (*ptr))
- ++ptr;
- }
- }
-
- line->nfields = i;
- }
-
- /* Read a line from FP into LINE and split it into fields.
- Return 0 if EOF, 1 otherwise. */
-
- static int
- get_line (fp, line)
- FILE *fp;
- struct line *line;
- {
- static int linesize = 80;
- int c, i;
- char *ptr;
-
- if (feof (fp))
- return 0;
-
- ptr = xmalloc (linesize);
-
- for (i = 0; (c = getc (fp)) != EOF && c != '\n'; ++i)
- {
- if (i == linesize)
- {
- linesize *= 2;
- ptr = xrealloc (ptr, linesize);
- }
- ptr[i] = c;
- }
-
- if (c == EOF && i == 0)
- {
- free (ptr);
- return 0;
- }
-
- line->beg = ptr;
- line->lim = line->beg + i;
- xfields (line);
- return 1;
- }
-
- static void
- freeline (line)
- struct line *line;
- {
- free ((char *) line->fields);
- free (line->beg);
- }
-
- static void
- initseq (seq)
- struct seq *seq;
- {
- seq->count = 0;
- seq->alloc = 1;
- seq->lines = (struct line *) xmalloc (seq->alloc * sizeof (struct line));
- }
-
- /* Read a line from FP and add it to SEQ. Return 0 if EOF, 1 otherwise. */
-
- static int
- getseq (fp, seq)
- FILE *fp;
- struct seq *seq;
- {
- if (seq->count == seq->alloc)
- {
- seq->alloc *= 2;
- seq->lines = (struct line *)
- xrealloc ((char *) seq->lines, seq->alloc * sizeof (struct line));
- }
-
- if (get_line (fp, &seq->lines[seq->count]))
- {
- ++seq->count;
- return 1;
- }
- return 0;
- }
-
- static void
- delseq (seq)
- struct seq *seq;
- {
- free ((char *) seq->lines);
- }
-
- /* Return <0 if the join field in LINE1 compares less than the one in LINE2;
- >0 if it compares greater; 0 if it compares equal. */
-
- static int
- keycmp (line1, line2)
- struct line *line1;
- struct line *line2;
- {
- char *beg1, *beg2; /* Start of field to compare in each file. */
- int len1, len2; /* Length of fields to compare. */
- int diff;
-
- if (join_field_1 < line1->nfields)
- {
- beg1 = line1->fields[join_field_1].beg;
- len1 = line1->fields[join_field_1].lim
- - line1->fields[join_field_1].beg;
- }
- else
- {
- beg1 = NULL;
- len1 = 0;
- }
-
- if (join_field_2 < line2->nfields)
- {
- beg2 = line2->fields[join_field_2].beg;
- len2 = line2->fields[join_field_2].lim
- - line2->fields[join_field_2].beg;
- }
- else
- {
- beg2 = NULL;
- len2 = 0;
- }
-
- if (len1 == 0)
- return len2 == 0 ? 0 : -1;
- if (len2 == 0)
- return 1;
- diff = memcmp (beg1, beg2, min (len1, len2));
- if (diff)
- return diff;
- return len1 - len2;
- }
-
- /* Print field N of LINE if it exists and is nonempty, otherwise
- `empty_filler' if it is nonempty. */
-
- static void
- prfield (n, line)
- int n;
- struct line *line;
- {
- int len;
-
- if (n < line->nfields)
- {
- len = line->fields[n].lim - line->fields[n].beg;
- if (len)
- fwrite (line->fields[n].beg, 1, len, stdout);
- else if (empty_filler)
- fputs (empty_filler, stdout);
- }
- else if (empty_filler)
- fputs (empty_filler, stdout);
- }
-
- /* Print LINE, with its fields separated by `tab'. */
-
- static void
- prline (line)
- struct line *line;
- {
- int i;
-
- for (i = 0; i < line->nfields; ++i)
- {
- prfield (i, line);
- if (i == line->nfields - 1)
- putchar ('\n');
- else
- putchar (tab ? tab : ' ');
- }
- }
-
- /* Print the join of LINE1 and LINE2. */
-
- static void
- prjoin (line1, line2)
- struct line *line1;
- struct line *line2;
- {
- if (outlist)
- {
- struct outlist *o;
-
- prfield (outlist->field - 1, outlist->file == 1 ? line1 : line2);
- for (o = outlist->next; o; o = o->next)
- {
- putchar (tab ? tab : ' ');
- prfield (o->field - 1, o->file == 1 ? line1 : line2);
- }
- putchar ('\n');
- }
- else
- {
- int i;
-
- prfield (join_field_1, line1);
- for (i = 0; i < join_field_1 && i < line1->nfields; ++i)
- {
- putchar (tab ? tab : ' ');
- prfield (i, line1);
- }
- for (i = join_field_1 + 1; i < line1->nfields; ++i)
- {
- putchar (tab ? tab : ' ');
- prfield (i, line1);
- }
-
- for (i = 0; i < join_field_2 && i < line2->nfields; ++i)
- {
- putchar (tab ? tab : ' ');
- prfield (i, line2);
- }
- for (i = join_field_2 + 1; i < line2->nfields; ++i)
- {
- putchar (tab ? tab : ' ');
- prfield (i, line2);
- }
- putchar ('\n');
- }
- }
-
- /* Print the join of the files in FP1 and FP2. */
-
- static void
- join (fp1, fp2)
- FILE *fp1;
- FILE *fp2;
- {
- struct seq seq1, seq2;
- struct line line;
- int diff, i, j, eof1, eof2;
-
- /* Read the first line of each file. */
- initseq (&seq1);
- getseq (fp1, &seq1);
- initseq (&seq2);
- getseq (fp2, &seq2);
-
- while (seq1.count && seq2.count)
- {
- diff = keycmp (&seq1.lines[0], &seq2.lines[0]);
- if (diff < 0)
- {
- if (print_unpairables_1)
- prline (&seq1.lines[0]);
- freeline (&seq1.lines[0]);
- seq1.count = 0;
- getseq (fp1, &seq1);
- continue;
- }
- if (diff > 0)
- {
- if (print_unpairables_2)
- prline (&seq2.lines[0]);
- freeline (&seq2.lines[0]);
- seq2.count = 0;
- getseq (fp2, &seq2);
- continue;
- }
-
- /* Keep reading lines from file1 as long as they continue to
- match the current line from file2. */
- eof1 = 0;
- do
- if (!getseq (fp1, &seq1))
- {
- eof1 = 1;
- ++seq1.count;
- break;
- }
- while (!keycmp (&seq1.lines[seq1.count - 1], &seq2.lines[0]));
-
- /* Keep reading lines from file2 as long as they continue to
- match the current line from file1. */
- eof2 = 0;
- do
- if (!getseq (fp2, &seq2))
- {
- eof2 = 1;
- ++seq2.count;
- break;
- }
- while (!keycmp (&seq1.lines[0], &seq2.lines[seq2.count - 1]));
-
- if (print_pairables)
- {
- for (i = 0; i < seq1.count - 1; ++i)
- for (j = 0; j < seq2.count - 1; ++j)
- prjoin (&seq1.lines[i], &seq2.lines[j]);
- }
-
- for (i = 0; i < seq1.count - 1; ++i)
- freeline (&seq1.lines[i]);
- if (!eof1)
- {
- seq1.lines[0] = seq1.lines[seq1.count - 1];
- seq1.count = 1;
- }
- else
- seq1.count = 0;
-
- for (i = 0; i < seq2.count - 1; ++i)
- freeline (&seq2.lines[i]);
- if (!eof2)
- {
- seq2.lines[0] = seq2.lines[seq2.count - 1];
- seq2.count = 1;
- }
- else
- seq2.count = 0;
- }
-
- if (print_unpairables_1 && seq1.count)
- {
- prline (&seq1.lines[0]);
- freeline (&seq1.lines[0]);
- while (get_line (fp1, &line))
- {
- prline (&line);
- freeline (&line);
- }
- }
-
- if (print_unpairables_2 && seq2.count)
- {
- prline (&seq2.lines[0]);
- freeline (&seq2.lines[0]);
- while (get_line (fp2, &line))
- {
- prline (&line);
- freeline (&line);
- }
- }
-
- delseq (&seq1);
- delseq (&seq2);
- }
-
- /* Add a field spec for field FIELD of file FILE to `outlist' and return 1,
- unless either argument is invalid; then just return 0. */
-
- static int
- add_field (file, field)
- int file;
- int field;
- {
- struct outlist *o;
-
- if (file < 1 || file > 2 || field < 1)
- return 0;
- o = (struct outlist *) xmalloc (sizeof (struct outlist));
- o->file = file;
- o->field = field;
- o->next = NULL;
-
- /* Add to the end of the list so the fields are in the right order. */
- if (outlist == NULL)
- outlist = o;
- else
- outlist_end->next = o;
- outlist_end = o;
-
- return 1;
- }
-
- /* Add the comma or blank separated field spec(s) in STR to `outlist'.
- Return the number of fields added. */
-
- static int
- add_field_list (str)
- char *str;
- {
- int added = 0;
- int file = -1, field = -1;
- int dot_found = 0;
-
- for (; *str; str++)
- {
- if (*str == ',' || isblank (*str))
- {
- added += add_field (file, field);
- file = field = -1;
- dot_found = 0;
- }
- else if (*str == '.')
- dot_found = 1;
- else if (ISDIGIT (*str))
- {
- if (!dot_found)
- {
- if (file == -1)
- file = 0;
- file = file * 10 + *str - '0';
- }
- else
- {
- if (field == -1)
- field = 0;
- field = field * 10 + *str - '0';
- }
- }
- else
- return 0;
- }
-
- added += add_field (file, field);
- return added;
- }
-
- /* When using getopt_long_only, no long option can start with
- a character that is a short option. */
- static struct option longopts[] =
- {
- {"j", 1, NULL, 'j'},
- {"j1", 1, NULL, '1'},
- {"j2", 1, NULL, '2'},
- {NULL, 0, NULL, 0}
- };
-
- void
- main (argc, argv)
- int argc;
- char *argv[];
- {
- char *names[2];
- FILE *fp1, *fp2;
- int optc, prev_optc = 0, nfiles, val;
-
- program_name = argv[0];
- nfiles = 0;
- print_pairables = 1;
-
- while ((optc = getopt_long_only (argc, argv, "-a:e:1:2:o:t:v:", longopts,
- (int *) 0)) != EOF)
- {
- switch (optc)
- {
- case 'a':
- val = atoi (optarg);
- if (val == 1)
- print_unpairables_1 = 1;
- else if (val == 2)
- print_unpairables_2 = 1;
- else
- error (2, 0, "invalid file number for `-a'");
- break;
-
- case 'e':
- empty_filler = optarg;
- break;
-
- case '1':
- val = atoi (optarg);
- if (val <= 0)
- error (2, 0, "invalid field number for `-1'");
- join_field_1 = val - 1;
- break;
-
- case '2':
- val = atoi (optarg);
- if (val <= 0)
- error (2, 0, "invalid field number for `-2'");
- join_field_2 = val - 1;
- break;
-
- case 'j':
- val = atoi (optarg);
- if (val <= 0)
- error (2, 0, "invalid field number for `-j'");
- join_field_1 = join_field_2 = val - 1;
- break;
-
- case 'o':
- if (add_field_list (optarg) == 0)
- error (2, 0, "invalid field list for `-o'");
- break;
-
- case 't':
- tab = *optarg;
- break;
-
- case 'v':
- val = atoi (optarg);
- if (val == 1)
- print_unpairables_1 = 1;
- else if (val == 2)
- print_unpairables_2 = 1;
- else
- error (2, 0, "invalid file number for `-v'");
- print_pairables = 0;
- break;
-
- case 1: /* Non-option argument. */
- if (prev_optc == 'o')
- {
- /* Might be continuation of args to -o. */
- if (add_field_list (optarg) > 0)
- continue; /* Don't change `prev_optc'. */
- }
-
- if (nfiles > 1)
- usage ();
- names[nfiles++] = optarg;
- break;
-
- case '?':
- usage ();
- }
- prev_optc = optc;
- }
-
- if (nfiles != 2)
- usage ();
-
- fp1 = strcmp (names[0], "-") ? fopen (names[0], "r") : stdin;
- if (!fp1)
- error (1, errno, "%s", names[0]);
- fp2 = strcmp (names[1], "-") ? fopen (names[1], "r") : stdin;
- if (!fp2)
- error (1, errno, "%s", names[1]);
- if (fp1 == fp2)
- error (1, errno, "both files cannot be standard input");
- join (fp1, fp2);
-
- if ((fp1 == stdin || fp2 == stdin) && fclose (stdin) == EOF)
- error (1, errno, "-");
- if (ferror (stdout) || fclose (stdout) == EOF)
- error (1, 0, "write error");
-
- exit (0);
- }
-
- static void
- usage ()
- {
- fprintf (stderr, "\
- Usage: %s [-a 1|2] [-v 1|2] [-e empty-string] [-o field-list...] [-t char]\n\
- [-j[1|2] field] [-1 field] [-2 field] file1 file2\n",
- program_name);
- exit (1);
- }
-