diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/build.c | 9 | ||||
| -rw-r--r-- | src/redo.c | 17 |
2 files changed, 24 insertions, 2 deletions
diff --git a/src/build.c b/src/build.c index 73fc757..d217a23 100644 --- a/src/build.c +++ b/src/build.c @@ -285,8 +285,8 @@ void add_dep(const char *target, int indent) { fp = fopen(dep_path, "w"); if (!fp) fatal(ERRM_FOPEN, dep_path); - /* skip the first n bytes that are reserved for the hash */ - fseek(fp, 20, SEEK_SET); + /* skip the first n bytes that are reserved for the hash + magic number */ + fseek(fp, 20 + sizeof(unsigned int), SEEK_SET); } else { fatal(ERRM_FOPEN, dep_path); } @@ -329,7 +329,9 @@ void hash_file(const char *target, unsigned char (*hash)[20]) { /* Calculate and store the hash of target in the right dependency file */ void write_dep_hash(const char *target) { + assert(getenv("REDO_MAGIC")); unsigned char hash[SHA_DIGEST_LENGTH]; + int magic = atoi(getenv("REDO_MAGIC")); hash_file(target, &hash); @@ -341,6 +343,9 @@ void write_dep_hash(const char *target) { if (write(out, hash, sizeof hash) < (ssize_t) sizeof hash) fatal("redo: failed to write hash to '%s'", dep_path); + if (write(out, &magic, sizeof(unsigned int)) < (ssize_t) sizeof(unsigned int)) + fatal("redo: failed to write magic number to '%s'", dep_path); + if (close(out)) fatal("redo: failed to close file descriptor."); free(dep_path); @@ -3,12 +3,18 @@ #include <stdlib.h> #include <sys/stat.h> #include <sys/types.h> +#include <time.h> +#include <math.h> +#include <limits.h> #include <unistd.h> #include "build.h" #include "util.h" #include "dbg.h" +static inline int digits(unsigned n) { + return (int) log10(n) + 1; +} int main(int argc, char *argv[]) { /* create .redo directory */ @@ -26,6 +32,17 @@ int main(int argc, char *argv[]) { free(cwd); + srand(time(NULL)); /* TODO: error checking */ + unsigned magic = rand(); + + char magic_str[digits(UINT_MAX) + 1]; + sprintf(magic_str, "%u", magic); + + printf("MAGIC: %s\n", magic_str); + + if (setenv("REDO_MAGIC", magic_str, 0)) + fatal("setenv()"); + if (argc < 2) { build_target("all"); } else { |