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astsa(3ast)

ksh-devel

Korn Shell development environment

NAME

astsa - standalone libast support

SYNOPSIS

#include <ast.h>
#include <ccode.h>
#include <error.h>
#include <option.h>
#include <stk.h>

DESCRIPTION

astsa is a standalone subset of ast(3) that requires only cdt(3) and sfio(3).
<ast.h> includes <ast_common.h>, <stdarg.h> or <varargs.h>, <sfio.h>, <limits.h>, and <limits.h> and <unistd.h> if supported by the local system.
The macros and functions provided by <ast.h> are described below. The other headers are described in ccode(3), error(3), optget(3), and stk(3).

MACROS

size_t elementsof(x)

Evaluates to the number of elements in the array variable x.

type* newof(void* old, type, size_t elements, size_t extra)

Equivalent to (type*)realloc((char*)old,sizeof(type)*elements+extra) if old!=0 and (type*)calloc(1,sizeof(type)*elements+extra) otherwise.

type* oldof(void* old, type, size_t elements, size_t extra)

Equivalent to (type*)realloc((char*)old,sizeof(type)*elements+extra) if old!=0 and (type*)malloc(1,sizeof(type)*elements+extra) otherwise.

size_t roundof(x,y)

Evaluates to x rounded up to the next power of 2 boundary y.

int ssizeof(x)

Equivalent to (int)sizeof(x).

int streq(a,b)

Equivalent to (*(a)==*(b)&&strcmp(a,b)==0).

int strneq(a,b,n)

Equivalent to (*(a)==*(b)&&strncmp(a,b,n)==0).

FUNCTIONS

void astwinsize(int fd, int* plines, int* pcolumns)

If plines!=0 then *plines is set to the number of lines on the tty device corresponding to fd. If pcolumns!=0 then *pcolumns is set to the number of columns on the tty device corresponding to fd. The default if fd is not a terminal device, or if fd queries fail, is 24 lines and 80 columns.

char* fmterror(int errno)

Returns the error message text corresponding to the errno(3) errno.

char* strerror(int errno)

Equivalent to fmterror(errno).

int strgrpmatch(const char* string, const char* pattern, int* sub, int nsub, int flags)

Matches the null terminated string against the null terminated ksh(1) augmented pattern. If sub!=0 then sub[2*i] is set to the start offset and sub[2*i+1] is set to the end offset of the i-th parenthesized subexpression. nsub is 1/2 the number of elements in sub. flags controls the matching:
STR_MAXIMAL:
Maximal match. The default is minimal (first) match.
STR_LEFT:
Implicit left anchor.
STR_RIGHT:
Implicit right anchor.
STR_ICASE:
Ignore case.
STR_GROUP:
(|&) inside [@|*|+{n,m}](...) only.

int strmatch(const char* string, const char* pattern, int* sub, int nsub, int flags)

Equivalent to strgrpmatch(string,pattern,0,0,STR_MAXIMAL|STR_LEFT|STR_RIGHT).
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