Mostly cosmetic updates

src/configfile.c

@@ -0,0 +1,257 @@
+/*
+ * tio - a simple serial terminal I/O application
+ *
+ * Copyright (c) 2020-2022  Liam Beguin
+ * Copyright (c) 2022  Martin Lund
+ *
+ * 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
+ * of the License, 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+#define _GNU_SOURCE
+#include "config.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <errno.h>
+#include <getopt.h>
+#include <termios.h>
+#include <limits.h>
+#include <unistd.h>
+#include <regex.h>
+#include <ini.h>
+#include "configfile.h"
+#include "misc.h"
+#include "options.h"
+#include "error.h"
+#include "print.h"
+
+static struct config_t *c;
+
+static int get_match(const char *input, const char *pattern, char **match)
+{
+    int ret;
+    int len = 0;
+    regex_t re;
+    regmatch_t m[2];
+    char err[128];
+
+    /* compile a regex with the pattern */
+    ret = regcomp(&re, pattern, REG_EXTENDED);
+    if (ret)
+    {
+        regerror(ret, &re, err, sizeof(err));
+        printf("reg error: %s\n", err);
+        return ret;
+    }
+
+    /* try to match on input */
+    ret = regexec(&re, input, 2, m, 0);
+    if (!ret)
+    {
+        len = m[1].rm_eo - m[1].rm_so;
+    }
+
+    regfree(&re);
+
+    if (len)
+    {
+        asprintf(match, "%s", &input[m[1].rm_so]);
+    }
+
+    return len;
+}
+
+/**
+ * data_handler() - walk config file to load parameters matching user input
+ *
+ * INIH handler used to get all parameters from a given section
+ */
+static int data_handler(void *user, const char *section, const char *name,
+                        const char *value)
+{
+    UNUSED(user);
+
+    if (strcmp(section, c->section_name))
+        return 0;
+
+    if (!strcmp(name, "tty"))
+    {
+        asprintf(&c->tty, value, c->match);
+        option.tty_device = c->tty;
+    }
+    else if (!strcmp(name, "baudrate"))
+    {
+        option.baudrate = string_to_long((char *)value);
+    }
+    else if (!strcmp(name, "databits"))
+    {
+        option.databits = atoi(value);
+    }
+    else if (!strcmp(name, "flow"))
+    {
+        asprintf(&c->flow, "%s", value);
+        option.flow = c->flow;
+    }
+    else if (!strcmp(name, "stopbits"))
+    {
+        option.stopbits = atoi(value);
+    }
+    else if (!strcmp(name, "parity"))
+    {
+        asprintf(&c->parity, "%s", value);
+        option.parity = c->parity;
+    }
+    else if (!strcmp(name, "output-delay"))
+    {
+        option.output_delay = atoi(value);
+    }
+    else if (!strcmp(name, "no-autoconnect"))
+    {
+        option.no_autoconnect = atoi(value);
+    }
+    else if (!strcmp(name, "log"))
+    {
+        option.log = atoi(value);
+    }
+    else if (!strcmp(name, "local-echo"))
+    {
+        option.local_echo = atoi(value);
+    }
+    else if (!strcmp(name, "timestamp"))
+    {
+        option.timestamp = atoi(value);
+    }
+    else if (!strcmp(name, "log-filename"))
+    {
+        asprintf(&c->log_filename, "%s", value);
+        option.log_filename = c->log_filename;
+    }
+    else if (!strcmp(name, "map"))
+    {
+        asprintf(&c->map, "%s", value);
+        option.map = c->map;
+    }
+
+    return 0;
+}
+
+/**
+ * section_search_handler() - walk config file to find section matching user input
+ *
+ * INIH handler used to resolve the section matching the user's input.
+ * This will look for the pattern element of each section and try to match it
+ * with the user input.
+ */
+static int section_search_handler(void *user, const char *section, const char
+                                  *varname, const char *varval)
+{
+    UNUSED(user);
+
+    if (strcmp(varname, "pattern"))
+        return 0;
+
+    if (!strcmp(varval, c->user))
+    {
+        /* pattern matches as plain text */
+        asprintf(&c->section_name, "%s", section);
+    }
+    else if (get_match(c->user, varval, &c->match) > 0)
+    {
+        /* pattern matches as regex */
+        asprintf(&c->section_name, "%s", section);
+    }
+
+    return 0;
+}
+
+static int resolve_config_file(void)
+{
+    asprintf(&c->path, "%s/tio/tiorc", getenv("XDG_CONFIG_HOME"));
+    if (!access(c->path, F_OK))
+    {
+        return 0;
+    }
+
+    asprintf(&c->path, "%s/.config/tio/tiorc", getenv("HOME"));
+    if (!access(c->path, F_OK))
+    {
+        return 0;
+    }
+
+    asprintf(&c->path, "%s/.tiorc", getenv("HOME"));
+    if (!access(c->path, F_OK))
+    {
+        return 0;
+    }
+
+    return -EINVAL;
+}
+
+void config_file_parse(const int argc, char *argv[])
+{
+    int ret;
+    int i;
+
+    c = malloc(sizeof(struct config_t));
+    memset(c, 0, sizeof(struct config_t));
+
+    resolve_config_file();
+
+    for (i = 1; i < argc; i++)
+    {
+        if (argv[i][0] != '-')
+        {
+            c->user = argv[i];
+            break;
+        }
+    }
+
+    if (!c->user)
+    {
+        return;
+    }
+
+    ret = ini_parse(c->path, section_search_handler, NULL);
+    if (!c->section_name)
+    {
+        debug_printf("unable to match user input to configuration section (%d)\n", ret);
+        return;
+    }
+
+    ret = ini_parse(c->path, data_handler, NULL);
+    if (ret < 0)
+    {
+        fprintf(stderr, "Error: unable to parse configuration file (%d)\n", ret);
+        exit(EXIT_FAILURE);
+    }
+}
+
+void config_exit(void)
+{
+    free(c->tty);
+    free(c->flow);
+    free(c->parity);
+    free(c->log_filename);
+    free(c->map);
+
+    free(c->match);
+    free(c->section_name);
+    free(c->path);
+
+    free(c);
+}