Blame src/output/tpax_output_error.c

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/**************************************************************/
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/*  tpax: a topological pax implementation                    */
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/*  Copyright (C) 2020--2021  SysDeer Technologies, LLC       */
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/*  Released under GPLv2 and GPLv3; see COPYING.TPAX.         */
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/**************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <tpax/tpax.h>
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#include "tpax_driver_impl.h"
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#include "tpax_dprintf_impl.h"
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static const char aclr_reset[]   = "\x1b[0m";
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static const char aclr_bold[]    = "\x1b[1m";
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static const char aclr_red[]     = "\x1b[31m";
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static const char aclr_green[]   = "\x1b[32m";
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static const char aclr_blue[]    = "\x1b[34m";
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static const char aclr_magenta[] = "\x1b[35m";
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static const char * const tpax_error_strings[TPAX_ERR_CAP] = {
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	[TPAX_ERR_FLOW_ERROR]      = "flow error: unexpected condition or other",
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	[TPAX_ERR_FLEE_ERROR]      = "flees and bugs and cats and mice",
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	[TPAX_ERR_NULL_CONTEXT]    = "null driver or unit context",
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	[TPAX_ERR_BAD_DATA]        = "corrupt or wrong daata",
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	[TPAX_ERR_FILE_CHANGED]    = "file has changed",
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	[TPAX_ERR_REGION_SIZE]     = "file too large for a memory snapshot",
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};
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static const char * tpax_output_error_header(const struct tpax_error_info * erri)
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{
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	if (erri->eflags & TPAX_ERROR_CHILD)
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		return "exec error upon";
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	else if (erri->eflags & TPAX_ERROR_TOP_LEVEL)
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		return "error logged in";
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	else if (erri->eflags & TPAX_ERROR_NESTED)
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		return "< returned to >";
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	else
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		return "distorted state";
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}
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static const char * tpax_output_unit_header(const struct tpax_error_info * erri)
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{
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	if (!(erri->eflags & TPAX_ERROR_CUSTOM))
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		return "while opening";
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	else
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		return "while parsing";
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}
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static const char * tpax_output_strerror(
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	const struct tpax_error_info * erri,
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	char (*errbuf)[256])
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{
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	if (erri->eflags & TPAX_ERROR_CUSTOM)
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		return ((erri->elibcode < 0) || (erri->elibcode >= TPAX_ERR_CAP))
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			? "internal error: please report to the maintainer"
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			: tpax_error_strings[erri->elibcode];
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	else if (erri->eflags & TPAX_ERROR_NESTED)
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		return "";
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	else if (erri->eflags & TPAX_ERROR_CHILD)
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		return "(see child process error messages)";
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	else if (erri->esyscode == ENOBUFS)
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		return "input error: string length exceeds buffer size";
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	else
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		return strerror_r(erri->esyscode,*errbuf,sizeof(*errbuf))
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			? "internal error: strerror_r(3) call failed"
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			: *errbuf;
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}
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static int tpax_output_error_record_plain(
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	const struct tpax_driver_ctx *	dctx,
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	const struct tpax_error_info *	erri)
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{
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	const char * epath;
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	char         errbuf[256];
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	int          fderr   = tpax_driver_fderr(dctx);
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	const char * errdesc = tpax_output_strerror(erri,&errbuf);
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	epath = erri->euctx
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		? *erri->euctx->path
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		: erri->eunit;
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	if (epath && !(erri->eflags & TPAX_ERROR_NESTED))
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		if (tpax_dprintf(
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				fderr,
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				"%s: [%s] '%s':\n",
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				dctx->program,
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				tpax_output_unit_header(erri),
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				epath) < 0)
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			return -1;
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	if (tpax_dprintf(
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			fderr,
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			"%s: %s %s(), line %d%s%s.\n",
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			dctx->program,
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			tpax_output_error_header(erri),
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			erri->efunction,
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			erri->eline,
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			strlen(errdesc) ? ": " : "",
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			errdesc) < 0)
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		return -1;
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	return 0;
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}
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static int tpax_output_error_record_annotated(
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	const struct tpax_driver_ctx *	dctx,
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	const struct tpax_error_info *	erri)
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{
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	const char * epath;
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	char         errbuf[256];
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	int          fderr   = tpax_driver_fderr(dctx);
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	const char * errdesc = tpax_output_strerror(erri,&errbuf);
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	epath = erri->euctx
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		? *erri->euctx->path
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		: erri->eunit;
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	if (epath && !(erri->eflags & TPAX_ERROR_NESTED))
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		if (tpax_dprintf(
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				fderr,
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				"%s%s%s:%s %s[%s]%s %s%s'%s'%s:\n",
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				aclr_bold,aclr_magenta,
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				dctx->program,
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				aclr_reset,
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				aclr_bold,
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				tpax_output_unit_header(erri),
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				aclr_reset,
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				aclr_bold,aclr_red,
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				epath,
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				aclr_reset) < 0)
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			return -1;
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	if (tpax_dprintf(
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			fderr,
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			"%s%s%s:%s %s%s%s %s%s%s()%s, %s%sline %d%s%s%s%s%s.\n",
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			aclr_bold,aclr_magenta,
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			dctx->program,
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			aclr_reset,
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			aclr_bold,
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			tpax_output_error_header(erri),
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			aclr_reset,
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			aclr_bold,aclr_blue,
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			erri->efunction,
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			aclr_reset,
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			aclr_bold,aclr_green,
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			erri->eline,
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			aclr_reset,
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			strlen(errdesc) ? ": " : "",
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			aclr_bold,
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			errdesc,
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			aclr_reset) < 0)
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		return -1;
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	return 0;
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}
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int tpax_output_error_record(
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	const struct tpax_driver_ctx *	dctx,
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	const struct tpax_error_info *	erri)
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{
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	if (dctx->cctx->drvflags & TPAX_DRIVER_ANNOTATE_NEVER)
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		return tpax_output_error_record_plain(dctx,erri);
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	else if (dctx->cctx->drvflags & TPAX_DRIVER_ANNOTATE_ALWAYS)
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		return tpax_output_error_record_annotated(dctx,erri);
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	else if (isatty(tpax_driver_fderr(dctx)))
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		return tpax_output_error_record_annotated(dctx,erri);
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	else
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		return tpax_output_error_record_plain(dctx,erri);
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}
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static int tpax_output_error_vector_plain(const struct tpax_driver_ctx * dctx)
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{
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	struct tpax_error_info ** perr;
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	for (perr=dctx->errv; *perr; perr++)
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		if (tpax_output_error_record_plain(dctx,*perr))
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			return -1;
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	return 0;
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}
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static int tpax_output_error_vector_annotated(const struct tpax_driver_ctx * dctx)
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{
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	struct tpax_error_info ** perr;
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	for (perr=dctx->errv; *perr; perr++)
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		if (tpax_output_error_record_annotated(dctx,*perr))
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			return -1;
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	return 0;
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}
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int tpax_output_error_vector(const struct tpax_driver_ctx * dctx)
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{
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	if (dctx->cctx->drvflags & TPAX_DRIVER_ANNOTATE_NEVER)
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		return tpax_output_error_vector_plain(dctx);
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	else if (dctx->cctx->drvflags & TPAX_DRIVER_ANNOTATE_ALWAYS)
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		return tpax_output_error_vector_annotated(dctx);
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	else if (isatty(tpax_driver_fderr(dctx)))
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		return tpax_output_error_vector_annotated(dctx);
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	else
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		return tpax_output_error_vector_plain(dctx);
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}