error handling

Collaboration diagram for error handling:

Typedefs
typedef int(*	agusererrf) (char *)

Enumerations
enum	agerrlevel_t { AGWARN , AGERR , AGMAX , AGPREV }

Functions
agerrlevel_t	agseterr (agerrlevel_t)
char *	aglasterr (void)
int	agerr (agerrlevel_t level, const char *fmt,...)
void	agerrorf (const char *fmt,...)
void	agwarningf (const char *fmt,...)
int	agerrors (void)
int	agreseterrors (void)
agusererrf	agseterrf (agusererrf)

Detailed Description

The library provides a variety of mechanisms to control the reporting of errors and warnings. A message is only written if its type has higher priority than a programmer-controlled minimum, which is AGWARN by default. The programmer can set this value using agseterr, which returns the previous value. Calling agseterr(AGMAX) turns off the writing of messages.

The function agerr is the main entry point for reporting an anomaly. The first argument indicates the type of message. Usually, the first argument is AGWARN or AGERR to indicate warnings and errors, respectively. Sometimes additional context information is only available in functions calling the function where the error is actually caught. In this case, the calling function can indicate that it is continuing the current error by using AGPREV as the first argument. The remaining arguments to agerr are the same as the arguments to printf.

The functions agwarningf and agerrorf are shorthand for agerr(AGWARN,...) and agerr(AGERR,...), respectively.

Some applications desire to directly control the writing of messages. Such an application can use the function agseterrf to register the function that the library should call to actually write the message. The previous error function is returned. By default, the message is written to stderr.

Errors not written are stored in a log file. The last recorded error can be retrieved by calling aglasterr. Unless the printing of error messages has been completely disabled by a call to agseterr(AGMAX), standard error must not be wide-oriented, even if a user-provided error printing function is provided.

The function agerrors returns non-zero if errors have been reported.

Typedef Documentation

agusererrf

typedef int(* agusererrf) (char *)

Definition at line 859 of file cgraph.h.

Enumeration Type Documentation

agerrlevel_t

enum agerrlevel_t

Enumerator
AGWARN
AGERR
AGMAX
AGPREV

Definition at line 858 of file cgraph.h.

Function Documentation

agerr()

int agerr	(	agerrlevel_t	level,
		const char *	fmt,
			...
	)

Definition at line 155 of file agerror.c.

References agerr_va().

Referenced by bundle(), compoundEdges(), dot_concentrate(), emit_clusters(), error_context(), init_rank(), init_xdot(), kkNeato(), majorization(), make_flat_adj_edges(), make_label(), multicolor(), neato_layout(), neatoModel(), poly_gencode(), setEdgeLen(), stress_majorization_kD_mkernel(), and twopi_layout().

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agerrorf()

void agerrorf	(	const char *	fmt,
			...
	)

Definition at line 165 of file agerror.c.

References AGERR, and agerr_va().

Referenced by aagerror(), aagerror(), add_tree_edge(), agalloc(), agapply(), agdelete(), agdictof(), aggetrec(), agraphof(), agrealloc(), agroot(), boxIntersectf(), bundle(), charsetToStr(), checkpath(), circleLayout(), clarify(), computeStep(), conjugate_gradient(), conjugate_gradient_f(), conjugate_gradient_mkernel(), contain_nodes(), coordOf(), delaunay_tri(), delaunay_triangulation(), deriveGraph(), do_ordering_for_nodes(), dotneato_args_initialize(), edge_bundling(), find_ints(), freeSurface(), get_triangles(), getsplinepoints(), gvconfig(), gvLayout(), gvLayoutJobs(), gvNEWcontext(), gvNextInputGraph(), gvplugin_library_load(), gvplugin_package_record(), gvPluginList(), gvprintf(), gvRender(), gvrender_resolve_color(), gvRenderContext(), gvRenderData(), gvRenderFilename(), gvRenderJobs(), htmlerror(), htmllex(), init_nop(), init_rank(), install_in_rank(), invalidate_path(), largeMinlen(), makeAddPoly(), makePoly(), makeSpline(), map_edge(), mkSurface(), neato_extra_args(), opensubg(), opensubg(), ordered_edges(), parse_style(), parseSegs(), picfontname(), PQ_insert(), rebuild_vlists(), record_init(), RectArea(), remove_overlap(), routesplines_(), seg_cmp(), setDouble(), setInt(), simpleSplineRoute(), size_html_img(), SparseMatrix_import_dot(), strong(), update(), user_pos(), virtual_weight(), and x_cutval().

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agerrors()

int agerrors

(

void

)

Definition at line 181 of file agerror.c.

References agmaxerr.

Referenced by dotread(), dotstring(), gvFreeContext(), and main().

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aglasterr()

char * aglasterr

(

void

)

Definition at line 44 of file agerror.c.

References agxbdisown(), agxbput(), free(), last, NULL, and streq().

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agreseterrors()

int agreseterrors

(

void

)

Definition at line 183 of file agerror.c.

References agmaxerr.

Referenced by CFrmSettings::drawGraph(), and main().

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agseterr()

agerrlevel_t agseterr

(

agerrlevel_t

lvl

)

Definition at line 38 of file agerror.c.

References agerrlevel.

Referenced by dotneato_args_initialize().

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agseterrf()

agusererrf agseterrf

(

agusererrf

newf

)

Definition at line 32 of file agerror.c.

References usererrf.

agwarningf()

void agwarningf	(	const char *	fmt,
			...
	)

Definition at line 173 of file agerror.c.

References agerr_va(), and AGWARN.

Referenced by _spline_edges(), addXLabels(), arrow_match_name(), cat_libfile(), check_fontname(), checkCompound(), checkExp(), checkStart(), chkNum(), chkNum(), chkPos(), compile_samerank(), compoundEdges(), dot_mincross(), dot_splines_(), edgeType(), emit_xdot(), epsf_init(), estimate_character_width_canonical(), fdp_initParams(), fdpSplines(), fillMap(), findCharset(), findStopColor(), firstlayer(), genroute(), get_metrics_for_font_family(), getAdjustMode(), getCluster(), gmlerror(), gvloadimage(), gvplugin_library_load(), gvrender_resolve_color(), gvrender_set_style(), gvusershape_file_access(), gvusershape_open(), htmlEntityUTF8(), init_job_pagination(), init_xdot(), initHTMLlexer(), initial_positions(), insert(), kkNeato(), layout(), lenattr(), make_flat_adj_edges(), makeCompoundEdge(), mark_clusters(), merge_oneway(), neatoMode(), neatoModel(), nomacros(), nomacros(), orthoEdges(), parse_layers(), parse_layerselect(), parse_style(), parseSegs(), poly_init(), poly_port(), ps_string(), rebuild_vlists(), record_port(), removeOverlapWith(), routesplines_(), safefile(), setAspect(), setattr(), setFDPAttr(), sgd(), size_html_cell(), size_html_tbl(), solve_model(), spline_edges0(), stress_majorization_kD_mkernel(), tuneControl(), twopi_layout(), unrecognized(), unsupported(), user_init(), user_shape(), user_spline(), versionStr2Version(), and write_xdots().

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