src/lib/var-expand.c

	var-expand.c revision 3b94ff5951db4d4eddb7a80ed4e3f61207202635
/* Copyright (C) 2003 Timo Sirainen */

#include "lib.h"
#include "str.h"
#include "strescape.h"
#include "var-expand.h"

struct var_expand_modifier {
    char key;
    const char *(*func)(const char *);
};

static const struct var_expand_modifier modifiers[] = {
    { 'L', t_str_lcase },
    { 'U', t_str_ucase },
    { 'E', str_escape },
    { '\0', NULL }
};

void var_expand(string_t *dest, const char *str,
        const struct var_expand_table *table)
{
        const struct var_expand_modifier *m;
        const struct var_expand_table *t;
    const char *var;
    unsigned int width;
    const char *(*modifier)(const char *);

    for (; *str != '\0'; str++) {
        if (*str != '%')
            str_append_c(dest, *str);
        else {
            str++;
            width = 0;
            while (*str >= '0' && *str <= '9') {
                width = width*10 + (*str - '0');
                str++;
            }

            modifier = NULL;
            for (m = modifiers; m->key != '\0'; m++) {
                if (m->key == *str) {
                    modifier = m->func;
                    str++;
                    break;
                }
            }

            if (*str == '\0')
                break;

            var = NULL;
            for (t = table; t->key != '\0'; t++) {
                if (t->key == *str) {
                    var = t->value != NULL ? t->value : "";
                    break;
                }
            }

            if (var == NULL) {
                /* not found */
                if (*str == '%')
                    var = "%";
            }

            if (var != NULL) {
                if (modifier != NULL)
                    var = modifier(var);
                if (width == 0)
                    str_append(dest, var);
                else
                    str_append_n(dest, var, width);
            }
        }
    }
}