source: mainline/uspace/lib/pcut/src/preproc.c@ 15d0046

/*
 * Copyright (c) 2014 Vojtech Horky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>

#define MAX_IDENTIFIER_LENGTH 256

static int counter = 0;

static void print_numbered_identifier(int value, FILE *output) {
        fprintf(output, "pcut_item_%d", value);
}

static void print_numbered_identifier2(int value, FILE *output) {
        fprintf(output, "pcut_item2_%d", value);
}

static void print_numbered_identifier3(int value, FILE *output) {
        fprintf(output, "pcut_item3_%d", value);
}

typedef struct {
        char name[MAX_IDENTIFIER_LENGTH];
        size_t length;
} identifier_t;

static void identifier_init(identifier_t *identifier) {
        identifier->name[0] = 0;
        identifier->length = 0;
}

static void identifier_add_char(identifier_t *identifier, char c) {
        if (identifier->length + 1 >= MAX_IDENTIFIER_LENGTH) {
                fprintf(stderr, "Identifier %s is too long, aborting!\n", identifier->name);
                exit(1);
        }

        identifier->name[identifier->length] = c;
        identifier->length++;
        identifier->name[identifier->length] = 0;
}

static void identifier_print_or_expand(identifier_t *identifier, FILE *output) {
        const char *name = identifier->name;
        if (strcmp(name, "PCUT_ITEM_NAME") == 0) {
                print_numbered_identifier(counter, output);
        } else if (strcmp(name, "PCUT_ITEM_NAME_PREV") == 0) {
                print_numbered_identifier(counter - 1, output);
        } else if (strcmp(name, "PCUT_ITEM_COUNTER_INCREMENT") == 0) {
                counter++;
        } else if (strcmp(name, "PCUT_ITEM2_NAME") == 0) {
                print_numbered_identifier2(counter, output);
        } else if (strcmp(name, "PCUT_ITEM3_NAME") == 0) {
                print_numbered_identifier3(counter, output);
        } else {
                fprintf(output, "%s", name);
        }
}

static int is_identifier_char(int c, int inside_identifier) {
        return isalpha(c) || (c == '_')
                        || (inside_identifier && isdigit(c));
}

int main() {
        FILE *input = stdin;
        FILE *output = stdout;

        int last_char_was_identifier = 0;
        identifier_t last_identifier;

        while (1) {
                int current_char = fgetc(input);
                if (current_char == EOF) {
                        break;
                }

                int current_char_denotes_identifier = is_identifier_char(current_char, last_char_was_identifier);
                if (current_char_denotes_identifier) {
                        if (!last_char_was_identifier) {
                                identifier_init(&last_identifier);
                        }
                        identifier_add_char(&last_identifier, current_char);
                        last_char_was_identifier = 1;
                } else {
                        if (last_char_was_identifier) {
                                identifier_print_or_expand(&last_identifier, output);
                        }
                        fprintf(stdout, "%c", current_char);
                        last_char_was_identifier = 0;
                }
        }

        if (last_char_was_identifier) {
                identifier_print_or_expand(&last_identifier, output);
        }
        fprintf(output, "\n");

        return 0;
}