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Diffstat (limited to 'src/libs6ps/s6ps_statparse.c')
-rw-r--r--src/libs6ps/s6ps_statparse.c186
1 files changed, 186 insertions, 0 deletions
diff --git a/src/libs6ps/s6ps_statparse.c b/src/libs6ps/s6ps_statparse.c
new file mode 100644
index 0000000..8cc5a93
--- /dev/null
+++ b/src/libs6ps/s6ps_statparse.c
@@ -0,0 +1,186 @@
+/* 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 "s6ps.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 ;
+}