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/* ISC license. */
#include <stdint.h>
#include <sys/types.h>
#include <errno.h>
#include <skalibs/uint64.h>
#include <skalibs/types.h>
#include <skalibs/stralloc.h>
#include <skalibs/tai.h>
#include "s6-ps.h"
/*
going to great lengths to avoid scanf(), but all this code
is still smaller than scanf (no floating point parsing etc.)
*/
#define STATVARS 49
typedef size_t pscan_func (char const *, void *) ;
typedef pscan_func *pscan_func_ref ;
static size_t f64 (char const *s, void *u64)
{
uint64_t *u = u64 ;
return uint64_scan(s, u) ;
}
#define DEFUNU(name, type) \
static size_t name (char const *s, void *p) \
{ \
uint64_t u ; \
size_t len = uint64_scan(s, &u) ; \
*(type *)p = u ; \
return len ; \
} \
#define DEFUNS(name, type) \
static size_t name (char const *s, void *p) \
{ \
int64_t d ; \
size_t len = int64_scan(s, &d) ; \
*(type *)p = d ; \
return len ; \
} \
DEFUNS(fint, int)
DEFUNS(fpid, pid_t)
DEFUNU(fdev, dev_t)
static pscan_func_ref scanfuncs[STATVARS] =
{
&fpid, /* ppid */
&fpid, /* pgrp */
&fpid, /* session */
&fdev, /* tty_nr */
&fpid, /* tpgid */
&f64, /* flags */
&f64, /* minflt */
&f64, /* cminflt */
&f64, /* majflt */
&f64, /* cmajflt */
&f64, /* utime */
&f64, /* stime */
&f64, /* cutime */
&f64, /* cstime */
&fint, /* priority */
&fint, /* nice */
&f64, /* num_threads */
&f64, /* itrealvalue */
&f64, /* starttime */
&f64, /* vsize */
&f64, /* rss */
&f64, /* rsslim */
&f64, /* startcode */
&f64, /* endcode */
&f64, /* startstack */
&f64, /* kstkesp */
&f64, /* kstkeip */
&f64, /* signal */
&f64, /* blocked */
&f64, /* sigignore */
&f64, /* sigcatch */
&f64, /* wchan */
&f64, /* nswap */
&f64, /* cnswap */
&fint, /* exit_signal */
&f64, /* processor */
&f64, /* rt_priority */
&f64, /* policy */
&f64, /* delayacct_blkio_ticks */
&f64, /* guest_time */
&f64, /* cguest_time */
&f64, /* start_data */
&f64, /* end_data */
&f64, /* start_brk */
&f64, /* arg_start */
&f64, /* arg_end */
&f64, /* env_start */
&f64, /* env_end */
&fint /* exit_code */
} ;
int s6ps_statparse (pscan_t *p)
{
uint64_t dummy64 ;
int dummyint ;
size_t pos = 0 ;
void *scanresults[STATVARS] =
{
&p->ppid,
&p->pgrp,
&p->session,
&p->ttynr,
&p->tpgid,
&dummy64,
&dummy64,
&dummy64,
&dummy64,
&dummy64,
&p->utime,
&p->stime,
&p->cutime,
&p->cstime,
&p->prio,
&p->nice,
&p->threads,
&dummy64,
&p->start,
&p->vsize,
&p->rss,
&p->rsslim,
&dummy64,
&dummy64,
&dummy64,
&dummy64,
&dummy64,
&dummy64,
&dummy64,
&dummy64,
&dummy64,
&p->wchan,
&dummy64,
&dummy64,
&dummy64,
&p->cpuno,
&p->rtprio,
&p->policy,
&dummy64,
&dummy64,
&dummy64,
&dummy64,
&dummy64,
&dummy64,
&dummy64,
&dummy64,
&dummy64,
&dummy64,
&dummyint
} ;
unsigned int i = 0 ;
if (!p->statlen) return 0 ;
pos = uint64_scan(p->data.s, &dummy64) ;
if (!pos) return 0 ;
if (dummy64 != p->pid) return 0 ;
if (pos + 5 + p->commlen > p->statlen) return 0 ;
if (p->data.s[pos++] != ' ') return 0 ;
if (p->data.s[pos++] != '(') return 0 ;
pos += p->commlen ;
if (p->data.s[pos++] != ')') return 0 ;
if (p->data.s[pos++] != ' ') return 0 ;
p->state = pos++ ;
for (; i < STATVARS ; i++)
{
size_t w ;
if (pos + 1 > p->statlen) return 0 ;
if (p->data.s[pos++] != ' ') return 0 ;
w = (*scanfuncs[i])(p->data.s + pos, scanresults[i]) ;
if (!w) return 0 ;
pos += w ;
}
return 1 ;
}
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