From c33ddc2e33d51da9391a81206a1d9e4a92d97d10 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Wed, 27 Aug 2014 03:57:08 -0400 Subject: [PATCH] date: use strbufs in date-formatting functions Many of the date functions write into fixed-size buffers. This is a minor pain, as we have to take special precautions, and frequently end up copying the result into a strbuf or heap-allocated buffer anyway (for which we sometimes use strcpy!). Let's instead teach parse_date, datestamp, etc to write to a strbuf. The obvious downside is that we might need to perform a heap allocation where we otherwise would not need to. However, it turns out that the only two new allocations required are: 1. In test-date.c, where we don't care about efficiency. 2. In determine_author_info, which is not performance critical (and where the use of a strbuf will help later refactoring). Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- builtin/commit.c | 20 ++++++++++---------- cache.h | 4 ++-- date.c | 13 +++++++------ fast-import.c | 20 +++++++++----------- ident.c | 26 +++++++++++--------------- test-date.c | 10 ++++++---- 6 files changed, 45 insertions(+), 48 deletions(-) diff --git a/builtin/commit.c b/builtin/commit.c index 5ed60364ce..8da0a9f3e3 100644 --- a/builtin/commit.c +++ b/builtin/commit.c @@ -520,19 +520,16 @@ static int sane_ident_split(struct ident_split *person) return 1; } -static int parse_force_date(const char *in, char *out, int len) +static int parse_force_date(const char *in, struct strbuf *out) { - if (len < 1) - return -1; - *out++ = '@'; - len--; + strbuf_addch(out, '@'); - if (parse_date(in, out, len) < 0) { + if (parse_date(in, out) < 0) { int errors = 0; unsigned long t = approxidate_careful(in, &errors); if (errors) return -1; - snprintf(out, len, "%lu", t); + strbuf_addf(out, "%lu", t); } return 0; @@ -542,7 +539,7 @@ static void determine_author_info(struct strbuf *author_ident) { char *name, *email, *date; struct ident_split author; - char date_buf[64]; + struct strbuf date_buf = STRBUF_INIT; name = getenv("GIT_AUTHOR_NAME"); email = getenv("GIT_AUTHOR_EMAIL"); @@ -588,9 +585,10 @@ static void determine_author_info(struct strbuf *author_ident) } if (force_date) { - if (parse_force_date(force_date, date_buf, sizeof(date_buf))) + strbuf_reset(&date_buf); + if (parse_force_date(force_date, &date_buf)) die(_("invalid date format: %s"), force_date); - date = date_buf; + date = date_buf.buf; } strbuf_addstr(author_ident, fmt_ident(name, email, date, IDENT_STRICT)); @@ -600,6 +598,8 @@ static void determine_author_info(struct strbuf *author_ident) export_one("GIT_AUTHOR_EMAIL", author.mail_begin, author.mail_end, 0); export_one("GIT_AUTHOR_DATE", author.date_begin, author.tz_end, '@'); } + + strbuf_release(&date_buf); } static void split_ident_or_die(struct ident_split *id, const struct strbuf *buf) diff --git a/cache.h b/cache.h index fcb511db70..96ecc1f158 100644 --- a/cache.h +++ b/cache.h @@ -1044,10 +1044,10 @@ enum date_mode { const char *show_date(unsigned long time, int timezone, enum date_mode mode); void show_date_relative(unsigned long time, int tz, const struct timeval *now, struct strbuf *timebuf); -int parse_date(const char *date, char *buf, int bufsize); +int parse_date(const char *date, struct strbuf *out); int parse_date_basic(const char *date, unsigned long *timestamp, int *offset); int parse_expiry_date(const char *date, unsigned long *timestamp); -void datestamp(char *buf, int bufsize); +void datestamp(struct strbuf *out); #define approxidate(s) approxidate_careful((s), NULL) unsigned long approxidate_careful(const char *, int *); unsigned long approxidate_relative(const char *date, const struct timeval *now); diff --git a/date.c b/date.c index 782de95d90..2c33468dfb 100644 --- a/date.c +++ b/date.c @@ -605,7 +605,7 @@ static int match_tz(const char *date, int *offp) return end - date; } -static int date_string(unsigned long date, int offset, char *buf, int len) +static void date_string(unsigned long date, int offset, struct strbuf *buf) { int sign = '+'; @@ -613,7 +613,7 @@ static int date_string(unsigned long date, int offset, char *buf, int len) offset = -offset; sign = '-'; } - return snprintf(buf, len, "%lu %c%02d%02d", date, sign, offset / 60, offset % 60); + strbuf_addf(buf, "%lu %c%02d%02d", date, sign, offset / 60, offset % 60); } /* @@ -735,13 +735,14 @@ int parse_expiry_date(const char *date, unsigned long *timestamp) return errors; } -int parse_date(const char *date, char *result, int maxlen) +int parse_date(const char *date, struct strbuf *result) { unsigned long timestamp; int offset; if (parse_date_basic(date, ×tamp, &offset)) return -1; - return date_string(timestamp, offset, result, maxlen); + date_string(timestamp, offset, result); + return 0; } enum date_mode parse_date_format(const char *format) @@ -766,7 +767,7 @@ enum date_mode parse_date_format(const char *format) die("unknown date format %s", format); } -void datestamp(char *buf, int bufsize) +void datestamp(struct strbuf *out) { time_t now; int offset; @@ -776,7 +777,7 @@ void datestamp(char *buf, int bufsize) offset = tm_to_time_t(localtime(&now)) - now; offset /= 60; - date_string(now, offset, buf, bufsize); + date_string(now, offset, out); } /* diff --git a/fast-import.c b/fast-import.c index d73f58cbe3..dc9f7a8ccb 100644 --- a/fast-import.c +++ b/fast-import.c @@ -1971,7 +1971,7 @@ static int parse_data(struct strbuf *sb, uintmax_t limit, uintmax_t *len_res) return 1; } -static int validate_raw_date(const char *src, char *result, int maxlen) +static int validate_raw_date(const char *src, struct strbuf *result) { const char *orig_src = src; char *endp; @@ -1989,11 +1989,10 @@ static int validate_raw_date(const char *src, char *result, int maxlen) return -1; num = strtoul(src + 1, &endp, 10); - if (errno || endp == src + 1 || *endp || (endp - orig_src) >= maxlen || - 1400 < num) + if (errno || endp == src + 1 || *endp || 1400 < num) return -1; - strcpy(result, orig_src); + strbuf_addstr(result, orig_src); return 0; } @@ -2001,7 +2000,7 @@ static char *parse_ident(const char *buf) { const char *ltgt; size_t name_len; - char *ident; + struct strbuf ident = STRBUF_INIT; /* ensure there is a space delimiter even if there is no name */ if (*buf == '<') @@ -2020,26 +2019,25 @@ static char *parse_ident(const char *buf) die("Missing space after > in ident string: %s", buf); ltgt++; name_len = ltgt - buf; - ident = xmalloc(name_len + 24); - strncpy(ident, buf, name_len); + strbuf_add(&ident, buf, name_len); switch (whenspec) { case WHENSPEC_RAW: - if (validate_raw_date(ltgt, ident + name_len, 24) < 0) + if (validate_raw_date(ltgt, &ident) < 0) die("Invalid raw date \"%s\" in ident: %s", ltgt, buf); break; case WHENSPEC_RFC2822: - if (parse_date(ltgt, ident + name_len, 24) < 0) + if (parse_date(ltgt, &ident) < 0) die("Invalid rfc2822 date \"%s\" in ident: %s", ltgt, buf); break; case WHENSPEC_NOW: if (strcmp("now", ltgt)) die("Date in ident must be 'now': %s", buf); - datestamp(ident + name_len, 24); + datestamp(&ident); break; } - return ident; + return strbuf_detach(&ident, NULL); } static void parse_and_store_blob( diff --git a/ident.c b/ident.c index 1d9b6e770d..9bcc4e11b8 100644 --- a/ident.c +++ b/ident.c @@ -9,7 +9,7 @@ static struct strbuf git_default_name = STRBUF_INIT; static struct strbuf git_default_email = STRBUF_INIT; -static char git_default_date[50]; +static struct strbuf git_default_date = STRBUF_INIT; #define IDENT_NAME_GIVEN 01 #define IDENT_MAIL_GIVEN 02 @@ -129,9 +129,9 @@ const char *ident_default_email(void) static const char *ident_default_date(void) { - if (!git_default_date[0]) - datestamp(git_default_date, sizeof(git_default_date)); - return git_default_date; + if (!git_default_date.len) + datestamp(&git_default_date); + return git_default_date.buf; } static int crud(unsigned char c) @@ -292,7 +292,6 @@ const char *fmt_ident(const char *name, const char *email, const char *date_str, int flag) { static struct strbuf ident = STRBUF_INIT; - char date[50]; int strict = (flag & IDENT_STRICT); int want_date = !(flag & IDENT_NO_DATE); int want_name = !(flag & IDENT_NO_NAME); @@ -320,15 +319,6 @@ const char *fmt_ident(const char *name, const char *email, die("unable to auto-detect email address (got '%s')", email); } - if (want_date) { - if (date_str && date_str[0]) { - if (parse_date(date_str, date, sizeof(date)) < 0) - die("invalid date format: %s", date_str); - } - else - strcpy(date, ident_default_date()); - } - strbuf_reset(&ident); if (want_name) { strbuf_addstr_without_crud(&ident, name); @@ -339,8 +329,14 @@ const char *fmt_ident(const char *name, const char *email, strbuf_addch(&ident, '>'); if (want_date) { strbuf_addch(&ident, ' '); - strbuf_addstr_without_crud(&ident, date); + if (date_str && date_str[0]) { + if (parse_date(date_str, &ident) < 0) + die("invalid date format: %s", date_str); + } + else + strbuf_addstr(&ident, ident_default_date()); } + return ident.buf; } diff --git a/test-date.c b/test-date.c index 10afaabbfa..94a6997a8f 100644 --- a/test-date.c +++ b/test-date.c @@ -19,19 +19,21 @@ static void show_dates(char **argv, struct timeval *now) static void parse_dates(char **argv, struct timeval *now) { + struct strbuf result = STRBUF_INIT; + for (; *argv; argv++) { - char result[100]; unsigned long t; int tz; - result[0] = 0; - parse_date(*argv, result, sizeof(result)); - if (sscanf(result, "%lu %d", &t, &tz) == 2) + strbuf_reset(&result); + parse_date(*argv, &result); + if (sscanf(result.buf, "%lu %d", &t, &tz) == 2) printf("%s -> %s\n", *argv, show_date(t, tz, DATE_ISO8601)); else printf("%s -> bad\n", *argv); } + strbuf_release(&result); } static void parse_approxidate(char **argv, struct timeval *now)