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#include <_proc.h>
#include <ctype.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* returns a pointer that can be set to NUL to undo the strcat */
static char *
strtcat(char *dst, const char *src)
{
char *s = dst + strlen(dst);
strcpy(s, src);
return s;
}
static void
do_proc(char *path)
{
const int bufl = 4096;
char *buf = malloc(bufl);
FILE *f;
{ /* read the psdata into buf */
char *s = strtcat(path, "mem");
f = fopen(path, "r");
*s = '\0';
if (!f) errx(1, "couldn't open '%s'", path);
fseek(f, (long)_libc_psdata, SEEK_SET);
if (fread(buf, 1, 128, f) <= 0) {
strcpy(buf, "(no psdata)");
}
buf[128] = '\0';
fclose(f);
}
printf("%20s %s\n", path, buf);
f = fopen(path, "r");
if (!f) errx(1, "couldn't open '%s'", path);
// TODO library for iterating over directories
for (;;) {
int len = fread(buf, 1, bufl, f);
if (len <= 0) break;
for (int pos = 0; pos < len; ) {
const char *end = memchr(buf + pos, 0, len - pos);
if (!end) {
errx(1, "unimplemented: buffer overflow");
}
size_t entryl = end - (buf + pos) + 1;
if (isdigit(buf[pos])) {
/* yup, no overflow check */
char *s = strtcat(path, buf + pos);
do_proc(path);
*s = '\0';
}
pos += entryl;
}
}
free(buf);
fclose(f);
}
int
main(void)
{
char *buf = malloc(4096);
strcpy(buf, "/proc/");
do_proc(buf);
return 0;
}
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