diff options
Diffstat (limited to 'src/output')
| -rw-r--r-- | src/output/tpax_output_error.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/src/output/tpax_output_error.c b/src/output/tpax_output_error.c new file mode 100644 index 0000000..69c4938 --- /dev/null +++ b/src/output/tpax_output_error.c @@ -0,0 +1,230 @@ +/******************************************************/ +/* tpax: a topological pax implementation */ +/* Copyright (C) 2020 Z. Gilboa */ +/* Released under GPLv2 and GPLv3; see COPYING.TPAX. */ +/******************************************************/ + +#include <stdio.h> +#include <string.h> +#include <errno.h> +#include <unistd.h> +#include <tpax/tpax.h> + +#include "tpax_driver_impl.h" +#include "tpax_dprintf_impl.h" + +static const char aclr_reset[] = "\x1b[0m"; +static const char aclr_bold[] = "\x1b[1m"; + +static const char aclr_red[] = "\x1b[31m"; +static const char aclr_green[] = "\x1b[32m"; +static const char aclr_blue[] = "\x1b[34m"; +static const char aclr_magenta[] = "\x1b[35m"; + +static const char * const tpax_error_strings[TPAX_ERR_CAP] = { + [TPAX_ERR_FLOW_ERROR] = "flow error: unexpected condition or other", + [TPAX_ERR_FLEE_ERROR] = "flees and bugs and cats and mice", + [TPAX_ERR_NULL_CONTEXT] = "null driver or unit context", + [TPAX_ERR_BAD_DATA] = "corrupt or wrong daata", +}; + +static const char * tpax_output_error_header(const struct tpax_error_info * erri) +{ + if (erri->eflags & TPAX_ERROR_CHILD) + return "exec error upon"; + + else if (erri->eflags & TPAX_ERROR_TOP_LEVEL) + return "error logged in"; + + else if (erri->eflags & TPAX_ERROR_NESTED) + return "< returned to >"; + + else + return "distorted state"; +} + +static const char * tpax_output_unit_header(const struct tpax_error_info * erri) +{ + if (!(erri->eflags & TPAX_ERROR_CUSTOM)) + return "while opening"; + + else + return "while parsing"; +} + +static const char * tpax_output_strerror( + const struct tpax_error_info * erri, + char (*errbuf)[256]) +{ + if (erri->eflags & TPAX_ERROR_CUSTOM) + return ((erri->elibcode < 0) || (erri->elibcode >= TPAX_ERR_CAP)) + ? "internal error: please report to the maintainer" + : tpax_error_strings[erri->elibcode]; + + else if (erri->eflags & TPAX_ERROR_NESTED) + return ""; + + else if (erri->eflags & TPAX_ERROR_CHILD) + return "(see child process error messages)"; + + else if (erri->esyscode == ENOBUFS) + return "input error: string length exceeds buffer size"; + + else + return strerror_r(erri->esyscode,*errbuf,sizeof(*errbuf)) + ? "internal error: strerror_r(3) call failed" + : *errbuf; + +} + +static int tpax_output_error_record_plain( + const struct tpax_driver_ctx * dctx, + const struct tpax_error_info * erri) +{ + const char * epath; + char errbuf[256]; + + int fderr = tpax_driver_fderr(dctx); + const char * errdesc = tpax_output_strerror(erri,&errbuf); + + epath = erri->euctx + ? *erri->euctx->path + : erri->eunit; + + if (epath && !(erri->eflags & TPAX_ERROR_NESTED)) + if (tpax_dprintf( + fderr, + "%s: [%s] '%s':\n", + dctx->program, + tpax_output_unit_header(erri), + epath) < 0) + return -1; + + if (tpax_dprintf( + fderr, + "%s: %s %s(), line %d%s%s.\n", + dctx->program, + tpax_output_error_header(erri), + erri->efunction, + erri->eline, + strlen(errdesc) ? ": " : "", + errdesc) < 0) + return -1; + + return 0; +} + +static int tpax_output_error_record_annotated( + const struct tpax_driver_ctx * dctx, + const struct tpax_error_info * erri) +{ + const char * epath; + char errbuf[256]; + + int fderr = tpax_driver_fderr(dctx); + const char * errdesc = tpax_output_strerror(erri,&errbuf); + + epath = erri->euctx + ? *erri->euctx->path + : erri->eunit; + + if (epath && !(erri->eflags & TPAX_ERROR_NESTED)) + if (tpax_dprintf( + fderr, + "%s%s%s:%s %s[%s]%s %s%s'%s'%s:\n", + + aclr_bold,aclr_magenta, + dctx->program, + aclr_reset, + + aclr_bold, + tpax_output_unit_header(erri), + aclr_reset, + + aclr_bold,aclr_red, + epath, + aclr_reset) < 0) + return -1; + + if (tpax_dprintf( + fderr, + "%s%s%s:%s %s%s%s %s%s%s()%s, %s%sline %d%s%s%s%s%s.\n", + + aclr_bold,aclr_magenta, + dctx->program, + aclr_reset, + + aclr_bold, + tpax_output_error_header(erri), + aclr_reset, + + aclr_bold,aclr_blue, + erri->efunction, + aclr_reset, + + aclr_bold,aclr_green, + erri->eline, + aclr_reset, + strlen(errdesc) ? ": " : "", + + aclr_bold, + errdesc, + aclr_reset) < 0) + return -1; + + return 0; +} + +int tpax_output_error_record( + const struct tpax_driver_ctx * dctx, + const struct tpax_error_info * erri) +{ + if (dctx->cctx->drvflags & TPAX_DRIVER_ANNOTATE_NEVER) + return tpax_output_error_record_plain(dctx,erri); + + else if (dctx->cctx->drvflags & TPAX_DRIVER_ANNOTATE_ALWAYS) + return tpax_output_error_record_annotated(dctx,erri); + + else if (isatty(tpax_driver_fderr(dctx))) + return tpax_output_error_record_annotated(dctx,erri); + + else + return tpax_output_error_record_plain(dctx,erri); +} + +static int tpax_output_error_vector_plain(const struct tpax_driver_ctx * dctx) +{ + struct tpax_error_info ** perr; + + for (perr=dctx->errv; *perr; perr++) + if (tpax_output_error_record_plain(dctx,*perr)) + return -1; + + return 0; +} + +static int tpax_output_error_vector_annotated(const struct tpax_driver_ctx * dctx) +{ + struct tpax_error_info ** perr; + + for (perr=dctx->errv; *perr; perr++) + if (tpax_output_error_record_annotated(dctx,*perr)) + return -1; + + return 0; +} + +int tpax_output_error_vector(const struct tpax_driver_ctx * dctx) +{ + if (dctx->cctx->drvflags & TPAX_DRIVER_ANNOTATE_NEVER) + return tpax_output_error_vector_plain(dctx); + + else if (dctx->cctx->drvflags & TPAX_DRIVER_ANNOTATE_ALWAYS) + return tpax_output_error_vector_annotated(dctx); + + else if (isatty(tpax_driver_fderr(dctx))) + return tpax_output_error_vector_annotated(dctx); + + else + return tpax_output_error_vector_plain(dctx); +} |