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/* csv - process a line of csv data and populate an indexed array with the
fields */
/*
Copyright (C) 2020 Free Software Foundation, Inc.
Bash 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 3 of the License, or
(at your option) any later version.
Bash 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 Bash. If not, see <http://www.gnu.org/licenses/>.
*/
/* See Makefile for compilation details. */
#include <config.h>
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
#include "bashansi.h"
#include <stdio.h>
#include "loadables.h"
#define CSV_ARRAY_DEFAULT "CSV"
#define NQUOTE 0
#define DQUOTE 1
/* Split LINE into comma-separated fields, storing each field into a separate
element of array variable CSV, starting at index 0. The format of LINE is
as described in RFC 4180. */
static int
csvsplit (csv, line, dstring)
SHELL_VAR *csv;
char *line, *dstring;
{
arrayind_t ind;
char *field, *prev, *buf, *xbuf;
int delim, qstate;
int b, rval;
xbuf = 0;
ind = 0;
field = prev = line;
do
{
if (*prev == '"')
{
if (xbuf == 0)
xbuf = xmalloc (strlen (prev) + 1);
buf = xbuf;
b = 0;
qstate = DQUOTE;
for (field = ++prev; *field; field++)
{
if (qstate == DQUOTE && *field == '"' && field[1] == '"')
buf[b++] = *field++; /* skip double quote */
else if (qstate == DQUOTE && *field == '"')
qstate = NQUOTE;
else if (qstate == NQUOTE && *field == *dstring)
break;
else
/* This copies any text between a closing double quote and the
delimiter. If you want to change that, make sure to do the
copy only if qstate == DQUOTE. */
buf[b++] = *field;
}
buf[b] = '\0';
}
else
{
buf = prev;
field = prev + strcspn (prev, dstring);
}
delim = *field;
*field = '\0';
bind_array_element (csv, ind, buf, 0);
ind++;
*field = delim;
if (delim == *dstring)
prev = field + 1;
}
while (delim == *dstring);
if (xbuf)
free (xbuf);
return (rval = ind); /* number of fields */
}
int
csv_builtin (list)
WORD_LIST *list;
{
int opt, rval;
char *array_name, *csvstring;
SHELL_VAR *v;
array_name = 0;
rval = EXECUTION_SUCCESS;
reset_internal_getopt ();
while ((opt = internal_getopt (list, "a:")) != -1)
{
switch (opt)
{
case 'a':
array_name = list_optarg;
break;
CASE_HELPOPT;
default:
builtin_usage ();
return (EX_USAGE);
}
}
list = loptend;
if (array_name == 0)
array_name = CSV_ARRAY_DEFAULT;
if (legal_identifier (array_name) == 0)
{
sh_invalidid (array_name);
return (EXECUTION_FAILURE);
}
if (list == 0)
{
builtin_error ("csv string argument required");
return (EX_USAGE);
}
v = find_or_make_array_variable (array_name, 1);
if (v == 0 || readonly_p (v) || noassign_p (v))
{
if (v && readonly_p (v))
err_readonly (array_name);
return (EXECUTION_FAILURE);
}
else if (array_p (v) == 0)
{
builtin_error ("%s: not an indexed array", array_name);
return (EXECUTION_FAILURE);
}
if (invisible_p (v))
VUNSETATTR (v, att_invisible);
array_flush (array_cell (v));
csvstring = list->word->word;
if (csvstring == 0 || *csvstring == 0)
return (EXECUTION_SUCCESS);
opt = csvsplit (v, csvstring, ",");
/* Maybe do something with OPT here, it's the number of fields */
return (rval);
}
/* Called when builtin is enabled and loaded from the shared object. If this
function returns 0, the load fails. */
int
csv_builtin_load (name)
char *name;
{
return (1);
}
/* Called when builtin is disabled. */
void
csv_builtin_unload (name)
char *name;
{
}
char *csv_doc[] = {
"Read comma-separated fields from a string.",
"",
"Parse STRING, a line of comma-separated values, into individual fields,",
"and store them into the indexed array ARRAYNAME starting at index 0.",
"If ARRAYNAME is not supplied, \"CSV\" is the default array name.",
(char *)NULL
};
struct builtin csv_struct = {
"csv", /* builtin name */
csv_builtin, /* function implementing the builtin */
BUILTIN_ENABLED, /* initial flags for builtin */
csv_doc, /* array of long documentation strings. */
"csv [-a ARRAY] string", /* usage synopsis; becomes short_doc */
0 /* reserved for internal use */
};
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