PARSECMD(10.2) PARSECMD(10.2)
NAMEparsecmd - parse device commands
SYNOPSIS
Cmdbuf* parsecmd(char *a, int n)
DESCRIPTION
Parsecmd is an interface to tokenize (see getfields(10.2)), that safely
parses a command, with blank-separated fields, as might be written to a
device's ctl file. The buffer a and count n can be those passed to the
driver's write function. Parsecmd converts the byte array (which might
not be null-terminated) to a null-terminated string, trimming any
trailing new line, before invoking tokenize to break the string into
arguments, interpreting blank and tab as field separators when they are
not quoted (in the style of sh(1)). It returns a pointer to a dynami‐
cally-allocated Cmdbuf structure, which holds a copy of the string as
modified by parsefields, and the resulting fields; it is defined as
follows:
typedef
struct Cmdbuf
{
char buf[128];
char *f[16];
int nf;
} Cmdbuf;
The array f holds the field pointers; nf gives the number of fields.
Cmdbuf is allocated by smalloc (see malloc(10.2)), and the caller is
responsible for freeing it using free.
SOURCE
/os/port/parse.c
/emu/port/dev.c
PARSECMD(10.2)
