/* See LICENSE file for copyright and license details. */
#include "common.h"
NUSAGE(EXIT_ERROR, "[-f makefile]");
int exit_status = 0;
struct style style = {
.max_line_length = 120,
.only_empty_blank_lines = 1
};
static void
set_line_continuation_joiner(struct line *line)
{
if (line->len && line->data[line->len - 1] == '\\') {
line->data[--line->len] = '\0';
/* Doesn't matter here if the first non-white space is # */
line->continuation_joiner = line->data[0] == '\t' ? '\t' : ' ';
} else {
line->continuation_joiner = '\0';
}
}
static void
check_line_continuations(struct line *lines, size_t nlines)
{
size_t i, cont_from = 0;
for (i = 0; i < nlines; i++) {
set_line_continuation_joiner(&lines[i]);
if (lines[i].continuation_joiner &&
(!i || !lines[i - 1].continuation_joiner) &&
is_line_blank(&lines[i])) {
warnf_confusing(WC_CONTINUATION_OF_BLANK,
"%s:%zu: initial line continuation on otherwise blank line, can cause confusion",
lines[i].path, lines[i].lineno);
}
if (!lines[i].continuation_joiner &&
i && lines[i - 1].continuation_joiner) {
warnf_confusing(WC_CONTINUATION_TO_BLANK,
"%s:%zu: terminal line continuation to blank line, can cause confusion",
lines[i].path, lines[i].lineno);
}
if (!lines[i].continuation_joiner && lines[i].eof) {
warnf_unspecified(WC_EOF_LINE_CONTINUATION,
"%s:%zu: line continuation at end of file, causes unspecified behaviour%s",
lines[i].path, lines[i].lineno,
!lines[i].nest_level ? "" :
", it is especially problematic in an included line");
printinfof(WC_EOF_LINE_CONTINUATION, "this implementation will remove the line continuation");
lines[i].continuation_joiner = 0;
}
if (i && lines[i - 1].continuation_joiner && lines[i].len) {
if (!isspace(lines[i].data[0])) {
if (lines[cont_from].len && !isspace(lines[cont_from].data[lines[cont_from].len - 1])) {
warnf_confusing(WC_SPACELESS_CONTINUATION,
"%s:%zu,%zu: <backslash> is proceeded by a non-white space "
"character at the same time as the next line%s begins with "
"a non-white space character, this can cause confusion as "
"the make utility will add a whitespace",
lines[cont_from].path, lines[cont_from].lineno,
lines[i].lineno, i == cont_from + 1 ? "" :
", that consist of not only a <backslash>,");
}
warnf_confusing(WC_UNINDENTED_CONTINUATION,
"%s:%zu: continuation of line is not indented, can cause confusion",
lines[i].path, lines[i].lineno);
}
cont_from = i;
} else if (lines[i].continuation_joiner) {
cont_from = i;
}
}
}
static enum line_class
classify_line(struct line *line)
{
int warned_bad_space = 0;
char *s;
if (!line->len)
return EMPTY;
s = line->data;
while (isspace(*s)) {
if (!warned_bad_space && !isblank(*s)) {
warned_bad_space = 1;
warnf_undefined(WC_LEADING_BAD_SPACE,
"%s:%zu: line contains leading white space other than"
"<space> and <tab>, which causes undefined behaviour",
line->path, line->lineno);
/* TODO what do we do here? */
}
s++;
}
if (*s == '#') {
if (line->data[0] != '#') {
/* TODO should not apply if command line */
warnf_undefined(WC_ILLEGAL_INDENT,
"%s:%zu: comment has leading white space, which is not legal",
line->path, line->lineno);
printinfof(WC_ILLEGAL_INDENT, "this implementation will recognise it as a comment line");
}
return COMMENT;
} else if (!*s) {
return BLANK;
} else if (line->data[0] == '\t') {
return COMMAND_LINE;
} else {
return OTHER;
}
}
int
main(int argc, char *argv[])
{
const char *path = NULL;
struct line *lines;
size_t nlines;
size_t i;
libsimple_default_failure_exit = EXIT_ERROR;
/* make(1) shall support mixing of options and operands (up to --) */
ARGBEGIN {
case 'f':
cmdline_opt_f(ARG(), &path);
break;
default:
usage();
} ARGEND;
if (argc)
usage();
setlocale(LC_ALL, ""); /* Required by wcwidth(3) */
lines = load_makefile(path, &nlines);
for (i = 0; i < nlines; i++) {
check_utf8_encoding(&lines[i]);
check_column_count(&lines[i]);
}
check_line_continuations(lines, nlines);
for (i = 0; i < nlines; i++) {
switch (classify_line(&lines[i])) {
case EMPTY:
break;
case BLANK:
if (style.only_empty_blank_lines) {
warnf_style(WC_NONEMPTY_BLANK, "%s:%zu: line is blank but not empty",
lines[i].path, lines[i].lineno);
}
break;
case COMMENT:
break;
case COMMAND_LINE:
case OTHER:
break;
default:
abort();
}
}
free(lines);
return exit_status;
}