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/* SPDX-License-Identifier: ISC */
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <stdio.h>
#include <fcntl.h>
#include "libcfg.h"
int rdline_init(rdline_t *t, int dirfd, const char *filename,
int argc, const char *const *argv)
{
int fd = openat(dirfd, filename, O_RDONLY);
if (fd == -1)
goto fail_open;
memset(t, 0, sizeof(*t));
t->fp = fdopen(fd, "r");
if (t->fp == NULL) {
close(fd);
goto fail_open;
}
t->filename = filename;
t->argc = argc;
t->argv = argv;
return 0;
fail_open:
perror(filename);
return -1;
}
void rdline_cleanup(rdline_t *t)
{
free(t->line);
fclose(t->fp);
}
static int read_raw_line(rdline_t *t)
{
size_t len = 0;
free(t->line);
t->line = NULL;
errno = 0;
if (getline(&t->line, &len, t->fp) < 0) {
if (errno) {
fprintf(stderr, "%s: %zu: %s\n", t->filename,
t->lineno, strerror(errno));
return -1;
}
return 1;
}
t->lineno += 1;
return 0;
}
static int normalize_line(rdline_t *t)
{
char *dst = t->line, *src = t->line;
bool string = false;
const char *errstr;
int c, ret = 0;
while (isspace(*src))
++src;
do {
c = *(src++);
if (c == '"') {
string = !string;
} else if (!string && c == '#') {
c = '\0';
} else if (!string && isspace(c)) {
if (*src == '#' || *src == '\0' || isspace(*src))
continue;
c = ' ';
} else if (c == '%') {
*(dst++) = c;
c = *(src++);
if (isdigit(c)) {
if ((c - '0') >= t->argc) {
errstr = "argument out of range";
goto fail;
}
ret += strlen(t->argv[c - '0']);
} else if (c != '%') {
errstr = "expected digit after '%%'";
goto fail;
}
} else if (string && c == '\\' && *src != '\0') {
*(dst++) = c;
c = *(src++);
}
*(dst++) = c;
} while (c != '\0');
if (string) {
errstr = "missing \"";
goto fail;
}
return ret;
fail:
fprintf(stderr, "%s: %zu: %s\n", t->filename, t->lineno, errstr);
return -1;
}
static void substitute(rdline_t *t, char *dst, char *src)
{
bool string = false;
while (*src != '\0') {
if (src[0] == '%' && isdigit(src[1])) {
strcpy(dst, t->argv[src[1] - '0']);
dst += strlen(dst);
src += 2;
} else if (src[0] == '%' && src[1] == '%') {
*(dst++) = '%';
src += 2;
} else {
if (*src == '"')
string = !string;
if (string && *src == '\\')
*(dst++) = *(src++);
*(dst++) = *(src++);
}
}
*(dst++) = '\0';
}
int rdline(rdline_t *t)
{
char *buffer = NULL;
int ret;
do {
if ((ret = read_raw_line(t)))
goto out;
if ((ret = normalize_line(t)) < 0)
goto out;
} while (t->line[0] == '\0');
if (ret == 0) {
substitute(t, t->line, t->line);
return 0;
}
buffer = calloc(1, strlen(t->line) + ret + 1);
if (buffer == NULL) {
fprintf(stderr, "%s: %zu: out of memory\n",
t->filename, t->lineno);
ret = -1;
goto out;
}
substitute(t, buffer, t->line);
ret = 0;
out:
free(t->line);
t->line = buffer;
return ret;
}
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