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author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2018-01-11 16:05:41 +0300 |
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committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2018-01-18 03:37:37 +0300 |
commit | 01b5cbe7012fb1eeffc5c143865569835bcd405e (patch) | |
tree | ba0a4ee6db6079ea3eeec7e35a9c942380e8f518 /scripts/basic | |
parent | 41f92cffba1908bc7acc847e498e34368be29dc7 (diff) |
fixdep: use malloc() and read() to load dep_file to buffer
Commit dee81e988674 ("fixdep: faster CONFIG_ search") changed how to
read files in which CONFIG options are searched. It used malloc()
and read() instead of mmap() because it needed to zero-terminate the
buffer in order to use strstr(). print_deps() was left untouched
since there was no reason to change it.
Now, I have two motivations to change it in the same way.
- do_config_file() and print_deps() do quite similar things; they
open a file, load it onto memory, and pass it to a parser function.
If we use malloc() and read() for print_deps() too, we can factor
out the common code. (I will do this in the next commit.)
- parse_dep_file() copies each token to a temporary buffer because
it needs to zero-terminate it to be passed to printf(). It is not
possible to modify the buffer directly because it is mmap'ed with
O_RDONLY. If we load the file content into a malloc'ed buffer, we
can insert '\0' after each token, and save memcpy(). (I will do
this in the commit after next.)
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'scripts/basic')
-rw-r--r-- | scripts/basic/fixdep.c | 56 |
1 files changed, 32 insertions, 24 deletions
diff --git a/scripts/basic/fixdep.c b/scripts/basic/fixdep.c index b9b4bbf4e8dd..91bb4c13f121 100644 --- a/scripts/basic/fixdep.c +++ b/scripts/basic/fixdep.c @@ -104,7 +104,6 @@ #include <sys/types.h> #include <sys/stat.h> -#include <sys/mman.h> #include <unistd.h> #include <fcntl.h> #include <string.h> @@ -308,24 +307,27 @@ static void do_config_file(const char *filename) * assignments are parsed not only by make, but also by the rather simple * parser in scripts/mod/sumversion.c. */ -static void parse_dep_file(void *map, size_t len) +static void parse_dep_file(char *m) { - char *m = map; - char *end = m + len; char *p; char s[PATH_MAX]; - int is_target; + int is_last, is_target; int saw_any_target = 0; int is_first_dep = 0; - while (m < end) { + while (1) { /* Skip any "white space" */ - while (m < end && (*m == ' ' || *m == '\\' || *m == '\n')) + while (*m == ' ' || *m == '\\' || *m == '\n') m++; + + if (!*m) + break; + /* Find next "white space" */ p = m; - while (p < end && *p != ' ' && *p != '\\' && *p != '\n') + while (*p && *p != ' ' && *p != '\\' && *p != '\n') p++; + is_last = (*p == '\0'); /* Is the token we found a target name? */ is_target = (*(p-1) == ':'); /* Don't write any target names into the dependency file */ @@ -373,6 +375,10 @@ static void parse_dep_file(void *map, size_t len) do_config_file(s); } } + + if (is_last) + break; + /* * Start searching for next token immediately after the first * "whitespace" character that follows this token. @@ -391,40 +397,42 @@ static void parse_dep_file(void *map, size_t len) printf("$(deps_%s):\n", target); } -static void print_deps(void) +static void print_deps(const char *filename) { struct stat st; int fd; - void *map; + char *buf; - fd = open(depfile, O_RDONLY); + fd = open(filename, O_RDONLY); if (fd < 0) { fprintf(stderr, "fixdep: error opening depfile: "); - perror(depfile); + perror(filename); exit(2); } if (fstat(fd, &st) < 0) { fprintf(stderr, "fixdep: error fstat'ing depfile: "); - perror(depfile); + perror(filename); exit(2); } if (st.st_size == 0) { - fprintf(stderr,"fixdep: %s is empty\n",depfile); close(fd); return; } - map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); - if ((long) map == -1) { - perror("fixdep: mmap"); - close(fd); - return; + buf = malloc(st.st_size + 1); + if (!buf) { + perror("fixdep: malloc"); + exit(2); } + if (read(fd, buf, st.st_size) != st.st_size) { + perror("fixdep: read"); + exit(2); + } + buf[st.st_size] = '\0'; + close(fd); - parse_dep_file(map, st.st_size); - - munmap(map, st.st_size); + parse_dep_file(buf); - close(fd); + free(buf); } int main(int argc, char *argv[]) @@ -440,7 +448,7 @@ int main(int argc, char *argv[]) cmdline = argv[3]; print_cmdline(); - print_deps(); + print_deps(depfile); return 0; } |