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/* Copyright (C) 2020 C. McEnroe <june@causal.agency>
*
* 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 3 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, see <https://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <err.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include "archive.h"
int escapeNull(FILE *file, const char *str) {
size_t n = fwrite(str, strlen(str), 1, file);
return (n ? 0 : -1);
}
int escapeURL(FILE *file, const char *str) {
static const char *Safe = {
"$-_.+!*'(),"
"0123456789"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
};
while (*str) {
size_t len = strspn(str, Safe);
if (len) {
size_t n = fwrite(str, len, 1, file);
if (!n) return -1;
}
str += len;
if (*str) {
int n = fprintf(file, "%%%02X", *str++);
if (n < 0) return n;
}
}
return 0;
}
int escapeXML(FILE *file, const char *str) {
while (*str) {
size_t len = strcspn(str, "\"&<");
if (len) {
size_t n = fwrite(str, len, 1, file);
if (!n) return -1;
}
str += len;
int n = 0;
switch (*str) {
break; case '"': str++; n = fprintf(file, """);
break; case '&': str++; n = fprintf(file, "&");
break; case '<': str++; n = fprintf(file, "<");
}
if (n < 0) return n;
}
return 0;
}
int templateRender(
FILE *file, const char *template,
const struct Variable vars[], EscapeFn *escape
) {
if (!escape) escape = escapeNull;
for (bool subst = false; *template; subst ^= true) {
size_t len = strcspn(template, "[]");
if (subst) {
const char *value = NULL;
for (const struct Variable *var = vars; var && var->name; ++var) {
if (strlen(var->name) != len) continue;
if (strncmp(var->name, template, len)) continue;
value = var->value;
break;
}
if (!value) {
errx(
EX_SOFTWARE, "no value for template variable %.*s",
(int)len, template
);
}
int error = escape(file, value);
if (error) return error;
} else if (len) {
size_t n = fwrite(template, len, 1, file);
if (!n) return -1;
}
template += len;
if (*template) template++;
}
return 0;
}
char *templateURL(const char *template, const struct Variable vars[]) {
size_t cap = strlen(template) + 1;
for (const struct Variable *var = vars; var->name; ++var) {
cap += 3 * strlen(var->value);
}
char *buf = malloc(cap);
if (!buf) err(EX_OSERR, "malloc");
FILE *file = fmemopen(buf, cap, "w");
if (!file) err(EX_OSERR, "fmemopen");
int error = templateRender(file, template, vars, escapeURL)
|| fclose(file);
assert(!error);
return buf;
}
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