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#define USAGE "depgen [-MP | -MT target | -MF output] <file>"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static char *
alloc1(size_t n)
{
static char mem[64*1<<10], *pmem = mem;
assert(mem+sizeof mem - pmem >= n && "oom");
pmem += n;
return pmem - n;
}
static char *
sdup(const char *s, size_t n)
{
return memcpy(alloc1(n+1), s, n);
}
static char *
catpath(const char *s1, const char *s2)
{
if (!s1) return strcpy(alloc1(strlen(s2)+1), s2);
size_t n1 = strlen(s1), n2 = strlen(s2), n;
char *x = alloc1(n = n1+1+n2+1);
memcpy(x, s1, n1);
x[n1] = '/';
memcpy(x+n1+1, s2, n2);
x[n1+n2+1] = 0;
for (char *p = x+1; *p; ++p) {
if (!memcmp(p, "/../", 4)) {
char *next = p+4, *q;
for (q = p - 1; q > x && *q != '/'; --q);
if (q == x) x = p = next;
else {
memmove(q+1, next, strlen(next)+1);
p = q-1;
}
}
}
return x;
}
static const char *
fileext(const char *path)
{
assert(path && *path && "empty");
const char *dot = NULL;
for (++path; *path; ++path) {
if (*path == '.') dot = path;
}
return dot ? dot+1 : "";
}
static const char *
withext(const char *path, const char *ext)
{
const char *oext, *file = path;
assert(*file && "no filename");
oext = fileext(file);
size_t len;
if (!*oext)
len = strlen(file);
else
len = oext - file - 1;
char *res = memcpy(alloc1(len + 1 + (ext ? strlen(ext) + 1 : 0)), file, len);
if (ext) {
res[len] = '.';
memcpy(res + len + 1, ext, strlen(ext));
}
return res;
}
static char *
dirname(const char *path)
{
const char *end = path + strlen(path);
while (end > path && *end != '/') --end;
return end == path ? NULL : sdup(path, end - path);
}
static FILE *out;
enum { MAXFILES = 200, MAXLINE = 2048 };
static const char *files[MAXFILES];
static int nfiles;
static int
dofile(const char *f)
{
int ret = 0;
assert(nfiles < MAXFILES);
files[nfiles++] = f;
FILE *fp = fopen(f, "r");
if (!fp) {
fprintf(stderr, "depgen ERR: ");
perror(f);
return 1;
}
char line[MAXLINE], hdr[MAXLINE];
for (int ln = 1; fgets(line, sizeof line, fp); ++ln) {
if (sscanf(line, " # include \"%[^\"]\"", hdr) == 1) {
const char *abspath = catpath(dirname(f), hdr);
for (int i = 0; files[i] && i < MAXFILES; ++i) {
if (!strcmp(files[i], abspath)) goto Skip;
}
fprintf(out, " %s", abspath);
if (dofile(abspath) != 0) {
fprintf(stderr, " #included from %s:%d\n", f, ln);
ret = 1;
}
}
Skip:;
}
if (ferror(fp)) perror(f);
fclose(fp);
return ret;
}
int
main(int argc, char **argv)
{
#define DIE(...) return fprintf(stderr, "depgen ERR: "__VA_ARGS__), fputc('\n', stderr), 1
const char *src = NULL, *targ = NULL, *mf = NULL;
int mp = 0;
for (int i = 1; i < argc; ++i) {
if (*argv[i] != '-') {
if (src) DIE("too many input files");
else src = argv[i];
} else if (!strcmp(argv[i], "-MT")) {
if (!(targ = argv[++i])) DIE("-MT missing arg");
} else if (!strcmp(argv[i], "-MF")) {
if (mf) DIE("too many output files\n");
if (!(mf = argv[++i])) DIE("-MF missing arg");
} else if (!strcmp(argv[i], "-MP")) {
mp = 1;
} else {
DIE("invalid arg '%s'", argv[i]);
}
}
if (!src) return fprintf(stderr, "Usage: "USAGE"\n"), 1;
if (mf && !(out = fopen(mf, "w"))) return perror(mf), 1;
else if (!out) out = stdout;
fprintf(out, "%s: %s", targ ? targ : withext(src, "o"), src);
int ret = dofile(src);
if (mp) for (int i = 1; files[i]; ++i) {
fprintf(out, "\n%s:", files[i]);
}
fputc('\n', out);
if (ferror(out)) ret += 4;
fclose(out);
return ret;
}
/* vim:set ts=3 sw=3 expandtab: */
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