From abee3d0e0dc7c7e4b733b0145c56bf8159a37a69 Mon Sep 17 00:00:00 2001 From: Denis Vlasenko Date: Wed, 26 Dec 2007 20:44:45 +0000 Subject: Fix xmalloc_fgets_str so that it really does NOT strip terminator. Add xmalloc_fgetline_str which does strip terminator, and use it in dpkg instead of xmalloc_fgets_str. netstat: use xmalloc_fgets_str - allows to eat strings with NULs (this fixes bug with some weird /proc/net/unix input) function old new delta xmalloc_fgets_internal - 191 +191 xmalloc_fgetline_str - 18 +18 do_info 116 120 +4 unix_do_one 451 447 -4 tcp_do_one 423 419 -4 send_tree 369 365 -4 xmalloc_fgets_str 178 15 -163 ------------------------------------------------------------------------------ (add/remove: 2/0 grow/shrink: 1/4 up/down: 213/-175) Total: 38 bytes text data bss dec hex filename 778445 832 7344 786621 c00bd busybox_old 778483 832 7344 786659 c00e3 busybox_unstripped --- libbb/fgets_str.c | 33 +++++++++++++++++++++++---------- libbb/get_line_from_file.c | 5 ++--- 2 files changed, 25 insertions(+), 13 deletions(-) (limited to 'libbb') diff --git a/libbb/fgets_str.c b/libbb/fgets_str.c index 1bc6c3b1c..d6fada1a1 100644 --- a/libbb/fgets_str.c +++ b/libbb/fgets_str.c @@ -10,10 +10,7 @@ #include "libbb.h" -/* Read up to (and including) TERMINATING_STRING from FILE and return it. - * Return NULL on EOF. */ - -char *xmalloc_fgets_str(FILE *file, const char *terminating_string) +static char *xmalloc_fgets_internal(FILE *file, const char *terminating_string, int chop_off) { char *linebuf = NULL; const int term_length = strlen(terminating_string); @@ -25,12 +22,12 @@ char *xmalloc_fgets_str(FILE *file, const char *terminating_string) while (1) { ch = fgetc(file); if (ch == EOF) { - free(linebuf); - return NULL; + if (idx == 0) + return linebuf; /* NULL */ + break; } - /* grow the line buffer as necessary */ - while (idx > linebufsz - 2) { + if (idx >= linebufsz) { linebufsz += 200; linebuf = xrealloc(linebuf, linebufsz); } @@ -40,14 +37,30 @@ char *xmalloc_fgets_str(FILE *file, const char *terminating_string) /* Check for terminating string */ end_string_offset = idx - term_length; - if (end_string_offset > 0 + if (end_string_offset >= 0 && memcmp(&linebuf[end_string_offset], terminating_string, term_length) == 0 ) { - idx -= term_length; + if (chop_off) + idx -= term_length; break; } } + /* Grow/shrink *first*, then store NUL */ linebuf = xrealloc(linebuf, idx + 1); linebuf[idx] = '\0'; return linebuf; } + +/* Read up to TERMINATING_STRING from FILE and return it, + * including terminating string. + * Non-terminated string can be returned if EOF is reached. + * Return NULL if EOF is reached immediately. */ +char *xmalloc_fgets_str(FILE *file, const char *terminating_string) +{ + return xmalloc_fgets_internal(file, terminating_string, 0); +} + +char *xmalloc_fgetline_str(FILE *file, const char *terminating_string) +{ + return xmalloc_fgets_internal(file, terminating_string, 1); +} diff --git a/libbb/get_line_from_file.c b/libbb/get_line_from_file.c index 1eb4af13c..ac4d14b1f 100644 --- a/libbb/get_line_from_file.c +++ b/libbb/get_line_from_file.c @@ -12,11 +12,10 @@ #include "libbb.h" /* This function reads an entire line from a text file, up to a newline - * or NUL byte, inclusive. It returns a malloc'ed char * which must be - * stored and free'ed by the caller. If end is NULL '\n' isn't considered + * or NUL byte, inclusive. It returns a malloc'ed char * which + * must be free'ed by the caller. If end is NULL '\n' isn't considered * end of line. If end isn't NULL, length of the chunk read is stored in it. * Return NULL if EOF/error */ - char *bb_get_chunk_from_file(FILE *file, int *end) { int ch; -- cgit v1.2.3