diff options
Diffstat (limited to 'debian/patches/upstream/write-correctly-handle-wide-characters.patch')
| -rw-r--r-- | debian/patches/upstream/write-correctly-handle-wide-characters.patch | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/debian/patches/upstream/write-correctly-handle-wide-characters.patch b/debian/patches/upstream/write-correctly-handle-wide-characters.patch new file mode 100644 index 0000000..97ffa50 --- /dev/null +++ b/debian/patches/upstream/write-correctly-handle-wide-characters.patch @@ -0,0 +1,195 @@ +From: =?utf-8?b?0L3QsNCx?= <nabijaczleweli@nabijaczleweli.xyz> +Date: Wed, 15 Mar 2023 16:16:31 +0100 +Subject: write: correctly handle wide characters +MIME-Version: 1.0 +Content-Type: text/plain; charset="utf-8" +Content-Transfer-Encoding: 8bit + +Do this by replacing fputc_careful() (notice that the description said +it's locale-aware ‒ it very much is /not/), with a fputs_careful() which +does the same thing, but if it were to output a byte in the \123 format, +first it checks whether this byte starts a valid multibyte character. + +If it does, and that character is printable, write it verbatim. +This means that + echo 'foo åäö ąęćźżń bar' | write nabijaczleweli pts/4 +instead of + foo \303\245\303\244\303\266 + \304\205\304\231\304\207\305\272\305\274\305\204 bar +yields + foo åäö ąęćźżń bar +or, more realistically, from a message I got earlier today, + Filip powiedzia\305\202 \305\274e zap\305\202aci jutro +becomes + Filip powiedział że zapłaci jutro + +Invalid/non-printable sequences get processed as before. + +Line reading in write must become getline() to avoid dealing with +partial characters: for example on input consisting solely of +ąęćźżń, where every {1} is an instance, the output would be + {42}ąęć\305\272żń{84}ąęćź\305\274ń{84}ąęćźż\305\204{39} +with just fixed-512 fgets() + +Bug-Debian: https://bugs.debian.org/826596 +--- + include/carefulputc.h | 60 +++++++++++++++++++++++++++++++++++++-------------- + login-utils/last.c | 4 +--- + term-utils/write.c | 25 ++++++--------------- + 3 files changed, 52 insertions(+), 37 deletions(-) + +diff --git a/include/carefulputc.h b/include/carefulputc.h +index 8860b12..740add6 100644 +--- a/include/carefulputc.h ++++ b/include/carefulputc.h +@@ -1,31 +1,59 @@ + #ifndef UTIL_LINUX_CAREFULPUTC_H + #define UTIL_LINUX_CAREFULPUTC_H + +-/* +- * A putc() for use in write and wall (that sometimes are sgid tty). +- * It avoids control characters in our locale, and also ASCII control +- * characters. Note that the locale of the recipient is unknown. +-*/ + #include <stdio.h> + #include <string.h> + #include <ctype.h> ++#ifdef HAVE_WIDECHAR ++#include <wctype.h> ++#endif ++#include <stdbool.h> + + #include "cctype.h" + +-static inline int fputc_careful(int c, FILE *fp, const char fail) ++/* ++ * A puts() for use in write and wall (that sometimes are sgid tty). ++ * It avoids control and invalid characters. ++ * The locale of the recipient is nominally unknown, ++ * but it's a solid bet that the encoding is compatible with the author's. ++ */ ++static inline int fputs_careful(const char * s, FILE *fp, const char ctrl, bool cr_lf) + { +- int ret; ++ int ret = 0; + +- if (isprint(c) || c == '\a' || c == '\t' || c == '\r' || c == '\n') +- ret = putc(c, fp); +- else if (!c_isascii(c)) +- ret = fprintf(fp, "\\%3o", (unsigned char)c); +- else { +- ret = putc(fail, fp); +- if (ret != EOF) +- ret = putc(c ^ 0x40, fp); ++ for (size_t slen = strlen(s); *s; ++s, --slen) { ++ if (*s == '\n') ++ ret = fputs(cr_lf ? "\r\n" : "\n", fp); ++ else if (isprint(*s) || *s == '\a' || *s == '\t' || *s == '\r') ++ ret = putc(*s, fp); ++ else if (!c_isascii(*s)) { ++#ifdef HAVE_WIDECHAR ++ wchar_t w; ++ size_t clen = mbtowc(&w, s, slen); ++ switch(clen) { ++ case (size_t)-2: // incomplete ++ case (size_t)-1: // EILSEQ ++ mbtowc(NULL, NULL, 0); ++ nonprint: ++ ret = fprintf(fp, "\\%3hho", *s); ++ break; ++ default: ++ if(!iswprint(w)) ++ goto nonprint; ++ ret = fwrite(s, 1, clen, fp); ++ s += clen - 1; ++ slen -= clen - 1; ++ break; ++ } ++#else ++ ret = fprintf(fp, "\\%3hho", *s); ++#endif ++ } else ++ ret = fputs((char[]){ ctrl, *s ^ 0x40, '\0' }, fp); ++ if (ret < 0) ++ return EOF; + } +- return (ret < 0) ? EOF : 0; ++ return 0; + } + + static inline void fputs_quoted_case(const char *data, FILE *out, int dir) +diff --git a/login-utils/last.c b/login-utils/last.c +index 8462927..8d08641 100644 +--- a/login-utils/last.c ++++ b/login-utils/last.c +@@ -404,7 +404,6 @@ static int list(const struct last_control *ctl, struct utmpx *p, time_t logout_t + char final[512]; + char utline[sizeof(p->ut_line) + 1]; + char domain[256]; +- char *s; + int mins, hours, days; + int r, len; + struct last_timefmt *fmt; +@@ -560,8 +559,7 @@ static int list(const struct last_control *ctl, struct utmpx *p, time_t logout_t + /* + * Print out "final" string safely. + */ +- for (s = final; *s; s++) +- fputc_careful(*s, stdout, '*'); ++ fputs_careful(final, stdout, '*', false); + + if (len < 0 || (size_t)len >= sizeof(final)) + putchar('\n'); +diff --git a/term-utils/write.c b/term-utils/write.c +index ee31580..01c3f35 100644 +--- a/term-utils/write.c ++++ b/term-utils/write.c +@@ -223,21 +223,6 @@ static void signal_handler(int signo) + signal_received = signo; + } + +-/* +- * write_line - like fputs(), but makes control characters visible and +- * turns \n into \r\n. +- */ +-static void write_line(char *s) +-{ +- while (*s) { +- const int c = *s++; +- +- if ((c == '\n' && fputc_careful('\r', stdout, '^') == EOF) +- || fputc_careful(c, stdout, '^') == EOF) +- err(EXIT_FAILURE, _("carefulputc failed")); +- } +-} +- + /* + * do_write - actually make the connection + */ +@@ -247,7 +232,8 @@ static void do_write(const struct write_control *ctl) + struct passwd *pwd; + time_t now; + struct tm *tm; +- char *host, line[512]; ++ char *host, *line = NULL; ++ size_t linelen = 0; + struct sigaction sigact; + + /* Determine our login name(s) before the we reopen() stdout */ +@@ -286,11 +272,14 @@ static void do_write(const struct write_control *ctl) + free(host); + printf("\r\n"); + +- while (fgets(line, sizeof(line), stdin) != NULL) { ++ while (getline(&line, &linelen, stdin) >= 0) { + if (signal_received) + break; +- write_line(line); ++ ++ if (fputs_careful(line, stdout, '^', true) == EOF) ++ err(EXIT_FAILURE, _("carefulputc failed")); + } ++ free(line); + printf("EOF\r\n"); + } + |