diff options
Diffstat (limited to 'debian/patches/wall-use-fputs_careful.patch')
| -rw-r--r-- | debian/patches/wall-use-fputs_careful.patch | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/debian/patches/wall-use-fputs_careful.patch b/debian/patches/wall-use-fputs_careful.patch new file mode 100644 index 0000000..f14f327 --- /dev/null +++ b/debian/patches/wall-use-fputs_careful.patch @@ -0,0 +1,215 @@ +From: наб <nabijaczleweli@nabijaczleweli.xyz> +Date: Wed, 15 Mar 2023 16:16:48 +0100 +Subject: wall: use fputs_careful() + +LINE_MAX only applies to teletypes in canonical mode: when stdin is a +file, it could still very much tear; start off at 512 for the sprintf(), +then use getline() like in write. + +The line wrapping has one suboptimal edge-case: + $ wall < all + + Broadcast message from nabijaczleweli@tarta (pts/4) (Tue Mar 14 22:31:25 + 2023): + + ^N^O^P^Q^R^S^T^U^V^W^X^Y^Z^[^\^]^^^_ + !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJ + KLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~^?\200\201\202\203\204\205\206 + \207\210\211\212\213\214\215\216\217\220\221\222\223\224\225\226\227\230\231\232 + \233\234\235\236\237\240\241\242\243\244\245\246\247\250\251\252\253\254\255\256 + \257\260\261\262\263\264\265\266\267\270\271\272\273\274\275\276\277\300\301\302 + \303\304\305\306\307\310\311\312\313\314\315\316\317\320\321\322\323\324\325\326 + \327\330\331\332\333\334\335\336\337\340\341\342\343\344\345\346\347\350\351\352 + \353\354\355\356\357\360\361\362\363\364\365\366\367\370\371\372\373\374\375\376 + \377 +but that's a pathological input, and the result is still infinitely +better than it was before, so fixing that is more trouble than it's +worth. + +Origin: https://github.com/util-linux/util-linux/commit/aa13246a1bf1be9e4f6eb331f4d4d2dbc875e22f +Bug-Debian: https://bugs.debian.org/826596 +--- + include/carefulputc.h | 42 +++++++++++++++++++++++++++++++++--------- + login-utils/last.c | 2 +- + term-utils/wall.c | 38 ++++++-------------------------------- + term-utils/write.c | 2 +- + 4 files changed, 41 insertions(+), 43 deletions(-) + +diff --git a/include/carefulputc.h b/include/carefulputc.h +index 38a61cc..8813783 100644 +--- a/include/carefulputc.h ++++ b/include/carefulputc.h +@@ -6,6 +6,7 @@ + #include <ctype.h> + #ifdef HAVE_WIDECHAR + #include <wctype.h> ++#include <wchar.h> + #endif + #include <stdbool.h> + +@@ -13,18 +14,35 @@ + * 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. ++ * but it's a solid bet that it's compatible with the author's. ++ * Use soft_width=0 to disable wrapping. + */ +-static inline int fputs_careful(const char * s, FILE *fp, const char ctrl, bool cr_lf) ++static inline int fputs_careful(const char * s, FILE *fp, const char ctrl, bool cr_lf, int soft_width) + { +- int ret = 0; ++ int ret = 0, col = 0; + + for (size_t slen = strlen(s); *s; ++s, --slen) { +- if (*s == '\n') ++ if (*s == '\t') ++ col += (7 - (col % 8)) - 1; ++ else if (*s == '\r') ++ col = -1; ++ else if (*s == '\a') ++ --col; ++ ++ if ((soft_width && col >= soft_width) || *s == '\n') { ++ if (soft_width) { ++ fprintf(fp, "%*s", soft_width - col, ""); ++ col = 0; ++ } + ret = fputs(cr_lf ? "\r\n" : "\n", fp); +- else if (isprint(*s) || *s == '\a' || *s == '\t' || *s == '\r') ++ if (*s == '\n' || ret < 0) ++ goto wrote; ++ } ++ ++ if (isprint(*s) || *s == '\a' || *s == '\t' || *s == '\r') { + ret = putc(*s, fp); +- else if (!isascii(*s)) { ++ ++col; ++ } else if (!isascii(*s)) { + #ifdef HAVE_WIDECHAR + wchar_t w; + size_t clen = mbtowc(&w, s, slen); +@@ -33,21 +51,27 @@ static inline int fputs_careful(const char * s, FILE *fp, const char ctrl, bool + case (size_t)-1: // EILSEQ + mbtowc(NULL, NULL, 0); + nonprint: +- ret = fprintf(fp, "\\%3hho", *s); ++ col += ret = fprintf(fp, "\\%3hho", *s); + break; + default: + if(!iswprint(w)) + goto nonprint; + ret = fwrite(s, 1, clen, fp); ++ if (soft_width) ++ col += wcwidth(w); + s += clen - 1; + slen -= clen - 1; + break; + } + #else +- ret = fprintf(fp, "\\%3hho", *s); ++ col += ret = fprintf(fp, "\\%3hho", *s); + #endif +- } else ++ } else { + ret = fputs((char[]){ ctrl, *s ^ 0x40, '\0' }, fp); ++ col += 2; ++ } ++ ++ wrote: + if (ret < 0) + return EOF; + } +diff --git a/login-utils/last.c b/login-utils/last.c +index e6a8c41..2acfb4a 100644 +--- a/login-utils/last.c ++++ b/login-utils/last.c +@@ -542,7 +542,7 @@ static int list(const struct last_control *ctl, struct utmpx *p, time_t logout_t + /* + * Print out "final" string safely. + */ +- fputs_careful(final, stdout, '*', false); ++ fputs_careful(final, stdout, '*', false, 0); + + if (len < 0 || (size_t)len >= sizeof(final)) + putchar('\n'); +diff --git a/term-utils/wall.c b/term-utils/wall.c +index ae8c22c..f375eca 100644 +--- a/term-utils/wall.c ++++ b/term-utils/wall.c +@@ -269,29 +269,13 @@ int main(int argc, char **argv) + exit(EXIT_SUCCESS); + } + +-static void buf_putc_careful(FILE *fs, int c) +-{ +- if (isprint(c) || c == '\a' || c == '\t' || c == '\r' || c == '\n') +- fputc(c, fs); +- else if (!isascii(c)) +- fprintf(fs, "\\%3o", (unsigned char)c); +- else +- fputs((char[]){ '^', c ^ 0x40, '\0' }, fs); +-} +- + static char *makemsg(char *fname, char **mvec, int mvecsz, + size_t *mbufsize, int print_banner) + { +- register int ch, cnt; +- char *p, *lbuf, *retbuf; ++ char *lbuf, *retbuf; + FILE * fs = open_memstream(&retbuf, mbufsize); +- long line_max; +- +- line_max = sysconf(_SC_LINE_MAX); +- if (line_max <= 0) +- line_max = 512; +- +- lbuf = xmalloc(line_max); ++ size_t lbuflen = 512; ++ lbuf = xmalloc(lbuflen); + + if (print_banner == TRUE) { + char *hostname = xgethostname(); +@@ -327,7 +311,7 @@ static char *makemsg(char *fname, char **mvec, int mvecsz, + will not overflow as long as %d takes at most 100 chars */ + fprintf(fs, "\r%*s\r\n", TERM_WIDTH, " "); + +- snprintf(lbuf, line_max, ++ snprintf(lbuf, lbuflen, + _("Broadcast message from %s@%s (%s) (%s):"), + whom, hostname, where, date); + fprintf(fs, "%-*.*s\007\007\r\n", TERM_WIDTH, TERM_WIDTH, lbuf); +@@ -372,18 +356,8 @@ static char *makemsg(char *fname, char **mvec, int mvecsz, + /* + * Read message from stdin. + */ +- while (fgets(lbuf, line_max, stdin)) { +- for (cnt = 0, p = lbuf; (ch = *p) != '\0'; ++p, ++cnt) { +- if (cnt == TERM_WIDTH || ch == '\n') { +- fprintf(fs, "%*s\r\n", TERM_WIDTH - cnt, ""); +- cnt = 0; +- } +- if (ch == '\t') +- cnt += (7 - (cnt % 8)); +- if (ch != '\n') +- buf_putc_careful(fs, ch); +- } +- } ++ while (getline(&lbuf, &lbuflen, stdin) >= 0) ++ fputs_careful(lbuf, fs, '^', true, TERM_WIDTH); + } + fprintf(fs, "%*s\r\n", TERM_WIDTH, " "); + +diff --git a/term-utils/write.c b/term-utils/write.c +index 231c77f..eda52d1 100644 +--- a/term-utils/write.c ++++ b/term-utils/write.c +@@ -276,7 +276,7 @@ static void do_write(const struct write_control *ctl) + if (signal_received) + break; + +- if (fputs_careful(line, stdout, '^', true) == EOF) ++ if (fputs_careful(line, stdout, '^', true, 0) == EOF) + err(EXIT_FAILURE, _("carefulputc failed")); + } + free(line); |