#define _POSIX_C_SOURCE 200809L /* strdup() */
#include "parse_file.h"
-#include <stddef.h> /* NULL */ // size_t
-#include <stdio.h> /* FILE, sprintf() */
-#include <stdint.h> /* uint8_t, uint32_t */
-#include <stdlib.h> /* free() */ // atoi()
-#include <string.h> /* strchr, strdup(), strlen() */ // strcmp()
+#include <stddef.h> /* size_t, NULL */
+#include <stdio.h> /* FILE, snprintf() */
+#include <stdint.h> /* int16_t,uint8_t,uint32_t, INT16_MIN, UINT{8,16,32}_MAX */
+#include <stdlib.h> /* atoi(), free() */
+#include <string.h> /* strchr, strcmp(), strdup(), strlen() */
#include <unistd.h> /* access(), F_OK */
-#include "err_try_fgets.h" /* err_line(), err_try_fgets(),
- * reset_err_try_fgets_counter()
- */
-#include "readwrite.h" /* try_fopen(),try_fclose(), textfile_width() */
-#include "rexit.h" /* exit_err() */
+#include "readwrite.h" /* try_fopen(), try_fclose(), textfile_width() */
+#include "rexit.h" /* exit_err(), exit_trouble() */
#include "try_malloc.h" /* try_malloc() */
-/* Return next token from "line" or NULL if none is found. Tokens either a)
- * start at the first non-whitespace character and end before the next
- * whitespace character after that; or b) if the first non-whitespace character
- * is a single quote followed by at least one other single quote some time later
- * on the line, the token starts after that first single quote and ends before
- * the second, with the next token_from_line() call starting its token search
- * after that second quote. The only way to return an empty string (instead of
- * NULL) as a token is to delimit the token by two succeeding single quotes.
- * */
-static char * token_from_line(char * line);
+/* Set by parse_file(), used by err_line() for more informative messages. */
+static uint32_t err_line_count = 0;
+static char * err_line_line = NULL;
+static char * err_line_intro = NULL;
+
+
/* Determines the end of the token_from_line() token. */
static void set_token_end(char ** start, char ** limit_char);
-static char * token_from_line(char * line)
+static void set_token_end(char ** start, char ** limit_char)
+{
+ char * end_quote = ('\'' == (* start)[0]) ? strchr(* start + 1, '\''): NULL;
+ * start = (end_quote) ? * start + 1 : *start;
+ if (end_quote)
+ {
+ * end_quote = '\0';
+ * limit_char = end_quote;
+ return;
+ }
+ char * space = strchr(*start, ' ');
+ char * tab = strchr(*start, '\t');
+ space = (!space || (tab && tab < space)) ? tab : space;
+ if (space)
+ {
+ * space = '\0';
+ }
+ *limit_char = strchr(*start, '\0');
+}
+
+
+
+extern void parse_file(char * path, void (* token_to_entry) (char *, char *))
+{
+ char * f_name = "read_new_config_file()";
+ char * prefix = "Failed reading config file: \"";
+ char * affix = "\". ";
+ size_t size = strlen(prefix) + strlen(path) + strlen(affix) + 1;
+ err_line_intro = try_malloc(size, f_name);
+ int test = snprintf(err_line_intro, size, "%s%s%s", prefix, path, affix);
+ exit_trouble(test < 0, f_name, "snprintf()");
+ exit_err(access(path, F_OK), err_line_intro);
+ FILE * file = try_fopen(path, "r", f_name);
+ uint32_t linemax = textfile_width(file);
+ err_line_line = try_malloc(linemax + 1, f_name);
+ err_line_count = 0;
+ err_line(0 == linemax, "File is empty.");
+ char * token0 = NULL; /* For final token_to_entry() if while() stagnates. */
+ char * token1;
+ char * err_val = "No value given.";
+ while (try_fgets(err_line_line, linemax + 1, file, f_name))
+ {
+ err_line_count++;
+ err_line(UINT32_MAX == err_line_count, "Line reaches max lines limit.");
+ char * line_copy = strdup(err_line_line);
+ token0 = token_from_line(line_copy);
+ if (token0)
+ {
+ err_line(0 == (token1 = token_from_line(NULL)), err_val);
+ token_to_entry(token0, token1);
+ token0 = NULL;
+ }
+ free(line_copy);
+ }
+ token_to_entry(token0, token1);
+ try_fclose(file, f_name);
+ free(err_line_line);
+ free(err_line_intro);
+}
+
+
+
+extern void err_line(uint8_t test, char * msg)
+{
+ if (!test)
+ {
+ return;
+ }
+ char * f_name = "err_line()";
+ char * prefix = " Offending line ";
+ char * affix = ":\n";
+ size_t size = strlen(err_line_intro) + strlen(msg) + strlen(prefix)
+ + 10 /* strlen for uint32_t representations */
+ + strlen(affix) + strlen(err_line_line) + 1;
+ char * err = try_malloc(size, f_name);
+ int ret = snprintf(err, size, "%s%s%s%d%s%s", err_line_intro, msg, prefix,
+ err_line_count, affix, err_line_line);
+ exit_trouble(ret < 0, f_name, "snprintf()");
+ exit_err(1, err);
+}
+
+
+
+extern char * token_from_line(char * line)
{
static char * final_char = NULL;
static char * limit_char = NULL;
-static void set_token_end(char ** start, char ** limit_char)
+extern void test_for_int(char * string, char type)
{
- char * end_quote = ('\'' == (*start)[0]) ? strchr(*start + 1, '\'') : NULL;
- *start = (end_quote) ? *start + 1 : *start;
- if (end_quote)
+ char * err;
+ if ('8' == type)
{
- *end_quote = '\0';
- *limit_char = end_quote;
- return;
+ err = "Value must be proper representation of unsigned 8 bit integer.";
}
- char * space = strchr(*start, ' ');
- char * tab = strchr(*start, '\t');
- space = (!space || (tab && tab < space)) ? tab : space;
- if (space)
+ if ('i' == type)
{
- * space = '\0';
+ err = "Value must be proper representation of signed 16 bit integer.";
}
- *limit_char = strchr(*start, '\0');
-}
-
-
-
-extern void set_uint8(struct Context * context, uint8_t * target)
-{
- char * err_uint8 = "Value not unsigned decimal number between 0 and 255.";
+ err_line(strlen(string) < 1, err);
uint8_t i;
- uint8_t is_uint8 = 1;
- for (i = 0; '\0' != context->token1[i]; i++)
+ uint8_t test;
+ for (i = 0; '\0' != string[i]; i++)
{
- if (i > 2 || '0' > context->token1[i] || '9' < context->token1[i])
- {
- is_uint8 = 0;
- }
+ char * err_many = "Value of too many characters.";
+ err_line(string[i + 1] && UINT8_MAX == i, err_many);
+ test = ( (0 == i && ('-' == string[i] || '+' == string[i]))
+ || ('0' <= string[i] && string[i] <= '9'));
+ err_line(!test, err);
}
- if (is_uint8 && atoi(context->token1) > UINT8_MAX)
- {
- is_uint8 = 0;
- }
- err_line(!(is_uint8), context->line, context->err_pre, err_uint8);
- *target = atoi(context->token1);
+ err_line(strlen(string) < 2 && ('-' == string[i] || '+' == string[i]), err);
+ err_line('8'==type && (atoi(string) < 0 || atoi(string) > UINT8_MAX), err);
+ test = 'i'==type && (atoi(string) < INT16_MIN || atoi(string) > INT16_MAX);
+ err_line(test, err);
}
-extern uint8_t set_val(struct Context * context, char * comparand,
+extern uint8_t set_val(char * token0, char * token1, char * comparand,
uint8_t * flags, uint8_t set_flag, char type,
char * element)
{
- char * err_out = "Outside appropriate definition's context.";
- char * err_singlechar = "Value must be single ASCII character.";
- if (!strcmp(context->token0, comparand))
+ if (!strcmp(token0, comparand))
{
- err_line(!(* flags & EDIT_STARTED),
- context->line, context->err_pre, err_out);
- * flags = * flags | set_flag;
+ char * err_out = "Outside appropriate definition's context.";
+ char * err_singlechar = "Value must be single ASCII character.";
+ err_line(!(*flags & EDIT_STARTED), err_out);
+ *flags = *flags | set_flag;
if ('s' == type)
{
- * (char **) element = strdup(context->token1);
+ * (char **) element = strdup(token1);
}
else if ('c' == type)
{
- err_line(1 != strlen(context->token1),
- context->line, context->err_pre, err_singlechar);
- * element = (context->token1)[0];
+ err_line(1 != strlen(token1), err_singlechar);
+ *element = (token1)[0];
}
else if ('8' == type)
{
- set_uint8(context, (uint8_t *) element);
+ test_for_int(token1, '8');
+ * (uint8_t *) element = atoi(token1);
}
- return 1;
- }
- return 0;
-}
-
-
-
-extern void parse_file(char * path, void (* token_to_entry) (struct Context *))
-{
- char * f_name = "read_new_config_file()";
- struct Context context;
- char * err_pre_prefix = "Failed reading config file: \"";
- char * err_pre_affix = "\". ";
- context.err_pre = try_malloc(strlen(err_pre_prefix) + strlen(path)
- + strlen(err_pre_affix) + 1, f_name);
- sprintf(context.err_pre, "%s%s%s", err_pre_prefix, path, err_pre_affix);
- exit_err(access(path, F_OK), context.err_pre);
- FILE * file = try_fopen(path, "r", f_name);
- uint32_t linemax = textfile_width(file);
- context.line = try_malloc(linemax + 1, f_name);
- reset_err_try_fgets_counter();
- err_line(0 == linemax, context.line, context.err_pre, "File is empty.");
- context.token0 = NULL; /* For token_to_entry() if while() stagnates. */
- char * err_val = "No value given.";
- char * err_many = "Too many values.";
- while (err_try_fgets(context.line, linemax + 1, file, context.err_pre, ""))
- {
- char * line_copy = strdup(context.line);
- context.token0 = token_from_line(line_copy);
- if (context.token0)
+ else if ('i' == type)
{
- err_line(0 == (context.token1 = token_from_line(NULL)),
- context.line, context.err_pre, err_val);
- err_line(NULL != token_from_line(NULL),
- context.line, context.err_pre, err_many);
- token_to_entry(&context);
- context.token0 = NULL;
+ test_for_int(token1, 'i');
+ * (int16_t *) element = atoi(token1);
}
- free(line_copy);
+ return 1;
}
- token_to_entry(&context);
- try_fclose(file, f_name);
- free(context.line);
- free(context.err_pre);
+ return 0;
}
projects / plomrogue / blobdiff