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Diffstat (limited to 'examples/loadables/csv.c')
| -rw-r--r-- | examples/loadables/csv.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/examples/loadables/csv.c b/examples/loadables/csv.c new file mode 100644 index 0000000..75b3772 --- /dev/null +++ b/examples/loadables/csv.c @@ -0,0 +1,206 @@ +/* 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 */ +}; |