diff options
Diffstat (limited to 'src/output/tbnf_output_error.c')
| -rw-r--r-- | src/output/tbnf_output_error.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/src/output/tbnf_output_error.c b/src/output/tbnf_output_error.c new file mode 100644 index 0000000..d607e54 --- /dev/null +++ b/src/output/tbnf_output_error.c @@ -0,0 +1,192 @@ +/**************************************************************/ +/* treebnf: a tree oriented bnf library */ +/* Copyright (C) 2024 SysDeer Technologies, LLC */ +/* Released under GPLv2 and GPLv3; see COPYING.TREEBNF. */ +/**************************************************************/ + +#include <stdio.h> +#include <string.h> +#include <errno.h> +#include <unistd.h> +#include <treebnf/treebnf.h> + +#include "treebnf_driver_impl.h" +#include "treebnf_dprintf_impl.h" + +static const char aclr_reset[] = "\x1b[0m"; +static const char aclr_bold[] = "\x1b[1m"; + +static const char aclr_green[] = "\x1b[32m"; +static const char aclr_blue[] = "\x1b[34m"; +static const char aclr_magenta[] = "\x1b[35m"; + +static const char * tbnf_output_error_header(const struct tbnf_error_info * erri) +{ + if (erri->eflags & TBNF_ERROR_CHILD) + return "exec error upon"; + + else if (erri->eflags & TBNF_ERROR_TOP_LEVEL) + return "error logged in"; + + else if (erri->eflags & TBNF_ERROR_NESTED) + return "< returned to >"; + + else + return "distorted state"; +} + +static const char * tbnf_output_strerror( + const struct tbnf_error_info * erri, + char (*errbuf)[256]) +{ + if (erri->eflags & TBNF_ERROR_CUSTOM) + return "flow error: unexpected condition or other"; + + else if (erri->eflags & TBNF_ERROR_NESTED) + return ""; + + else if (erri->eflags & TBNF_ERROR_CHILD) + return "(see child process error messages)"; + + else if (erri->esyscode == ENOBUFS) + return "input error: string length exceeds buffer size"; + + else if ((erri->esyscode == ENOENT) && erri->eany) + return "path not found: "; + + else + return strerror_r(erri->esyscode,*errbuf,sizeof(*errbuf)) + ? "internal error: strerror_r(3) call failed" + : *errbuf; +} + +static int tbnf_output_error_record_plain( + const struct tbnf_driver_ctx * dctx, + const struct tbnf_error_info * erri) +{ + char errbuf[256]; + + int fderr = tbnf_driver_fderr(dctx); + const char * errdesc = tbnf_output_strerror(erri,&errbuf); + const char * path; + + path = ((erri->esyscode == ENOENT) && erri->eany) + ? erri->eany : ""; + + if (tbnf_dprintf( + fderr, + "%s: %s %s(), line %d%s%s%s.\n", + dctx->program, + tbnf_output_error_header(erri), + erri->efunction, + erri->eline, + strlen(errdesc) ? ": " : "", + errdesc,path) < 0) + return -1; + + return 0; +} + +static int tbnf_output_error_record_annotated( + const struct tbnf_driver_ctx * dctx, + const struct tbnf_error_info * erri) +{ + char errbuf[256]; + + int fderr = tbnf_driver_fderr(dctx); + const char * errdesc = tbnf_output_strerror(erri,&errbuf); + const char * path; + + path = ((erri->esyscode == ENOENT) && erri->eany) + ? erri->eany : ""; + + if (tbnf_dprintf( + fderr, + "%s%s%s:%s %s%s%s %s%s%s()%s, %s%sline %d%s%s%s%s%s%s%s%s%s.\n", + + aclr_bold,aclr_magenta, + dctx->program, + aclr_reset, + + aclr_bold, + tbnf_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, + + aclr_bold,aclr_blue, + path, + aclr_reset) < 0) + return -1; + + return 0; +} + +int tbnf_output_error_record( + const struct tbnf_driver_ctx * dctx, + const struct tbnf_error_info * erri) +{ + int fderr = tbnf_driver_fderr(dctx); + + if (dctx->cctx->drvflags & TBNF_DRIVER_ANNOTATE_NEVER) + return tbnf_output_error_record_plain(dctx,erri); + + else if (dctx->cctx->drvflags & TBNF_DRIVER_ANNOTATE_ALWAYS) + return tbnf_output_error_record_annotated(dctx,erri); + + else if (isatty(fderr)) + return tbnf_output_error_record_annotated(dctx,erri); + + else + return tbnf_output_error_record_plain(dctx,erri); +} + +static int tbnf_output_error_vector_plain(const struct tbnf_driver_ctx * dctx) +{ + struct tbnf_error_info ** perr; + + for (perr=dctx->errv; *perr; perr++) + if (tbnf_output_error_record_plain(dctx,*perr)) + return -1; + + return 0; +} + +static int tbnf_output_error_vector_annotated(const struct tbnf_driver_ctx * dctx) +{ + struct tbnf_error_info ** perr; + + for (perr=dctx->errv; *perr; perr++) + if (tbnf_output_error_record_annotated(dctx,*perr)) + return -1; + + return 0; +} + +int tbnf_output_error_vector(const struct tbnf_driver_ctx * dctx) +{ + int fderr = tbnf_driver_fderr(dctx); + + if (dctx->cctx->drvflags & TBNF_DRIVER_ANNOTATE_NEVER) + return tbnf_output_error_vector_plain(dctx); + + else if (dctx->cctx->drvflags & TBNF_DRIVER_ANNOTATE_ALWAYS) + return tbnf_output_error_vector_annotated(dctx); + + else if (isatty(fderr)) + return tbnf_output_error_vector_annotated(dctx); + + else + return tbnf_output_error_vector_plain(dctx); +} |