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parser.c

/* aewm - Copyright 1998-2007 Decklin Foster <decklin@red-bean.com>.
 * This program is free software; please see LICENSE for details. */

#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "common.h"
#include "parser.h"

/* If the user specifies an rc file, return NULL immediately if it's not
 * found; otherwise, search for the usual suspects. */

FILE *open_rc(char *rcfile, char *def)
{
    FILE *rc;
    char buf[BUF_SIZE];

    if (rcfile) {
        return fopen(rcfile, "r");
    } else {
        snprintf(buf, sizeof buf, "%s/.aewm/%s", getenv("HOME"), def);
        if ((rc = fopen(buf, "r"))) {
            return rc;
        } else {
            snprintf(buf, sizeof buf, "%s/%s", SYS_RC_DIR, def);
            return fopen(buf, "r");
        }
    }
}

char *get_rc_line(char *s, int size, FILE *stream)
{
    while (fgets(s, size, stream)) {
        if (s[0] == '#' || s[0] == '\n')
            continue;
        else
            return s;
    }
    return NULL;
}

/* Our crappy parser. A token is either a whitespace-delimited word, or a
 * bunch of words in double quotes (backslashes are permitted in either case).
 * src points to somewhere in a buffer -- the caller must save the location of
 * this buffer, because we update src to point past all the tokens found so
 * far. If we find a token, we write it into dest (caller is responsible for
 * allocating storage) and return 1. Otherwise return 0. */

int get_token(char **src, char *dest)
{
    int quoted = 0, nchars = 0;

    while (**src && isspace(**src)) (*src)++;

    if (**src == '"') {
        quoted = 1;
        (*src)++;
    }

    while (**src) {
        if (quoted) {
            if (**src == '"') {
                (*src)++;
                break;
            }
        } else {
            if (isspace(**src))
                break;
        }
        if (**src == '\\') (*src)++;
        *dest++ = *(*src)++;
        nchars++;
    }

    *dest = '\0';
    return nchars || quoted;
}

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