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cbuild.c
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cbuild.c
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#define foobarbaz /*
# A shell script within a source file. Ugly, but it works...
TRGT='cbuild'
for i in $@ ; do
if [ "$i" = "--make-compiled" ] ; then
echo "Compiling '$TRGT', please wait..."
gcc -W -Wall -O2 -o $TRGT $0
exit $?
fi
done
gcc -W -Wall -Werror -o /tmp/$TRGT "$0" && { "/tmp/$TRGT" `for i in $@ ; do echo "$i" ; done` ; RET=$? ; rm -f "/tmp/$TRGT" ; exit $RET ; }
exit $?
*/
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#ifdef _WIN32
static void setenv(const char *env, const char *val, int overwrite)
{
static char buf[128];
if(!overwrite && getenv(env))
return;
snprintf(buf, sizeof(buf), "%s=%s", env, val);
_putenv(buf);
}
static void unsetenv(const char *env)
{
setenv(env, "", 1);
}
#ifdef _MSC_VER
#define strcasecmp stricmp
#define strncasecmp strnicmp
#define snprintf _snprintf
#endif
#endif /* Win32 */
#define INVOKE_BKP_SIZE 16
struct {
FILE *f;
char *bkp_lbuf;
char *bkp_nextline;
int bkp_line;
int bkp_did_else;
int bkp_did_cmds;
int bkp_do_level;
} invoke_backup[INVOKE_BKP_SIZE];
static struct stat statbuf;
static char linebuf[64*1024];
static char buffer[64*1024];
static char *loaded_files;
static char *sources;
static char obj[64];
#define SRC_PATH_SIZE 32
static char *src_paths[SRC_PATH_SIZE];
/* getvar: Safely gets an environment variable, returning an empty string
* instead of NULL
*/
static const char *getvar(const char *env)
{
const char *var;
var = getenv(env);
return (var?var:"");
}
/* find_src: Attempts to find the named sourcefile by searching the paths
* listed in src_paths. It returns the passed string if the file exists as-is,
* or if it couldn't be found.
*/
static char *find_src(char *src)
{
static char buf[64];
struct stat statbuf;
int i;
if(stat(src, &statbuf) == 0 || !src_paths[0])
return src;
for(i = 0;src_paths[i] && i < SRC_PATH_SIZE;++i)
{
snprintf(buf, sizeof(buf), "%s/%s", src_paths[i], src);
if(stat(buf, &statbuf) == 0)
return buf;
}
return src;
}
/* check_obj_deps: Checks a file's dependancy list. The dependancy file is a
* file expected to be in dep_dir and with the same name, but with a different
* extension. The format of the file is simply: 'file.o: dependancies...' where
* a '\' at the end of the line can be used as a next-line continuation. If the
* dependancy file exists, none of the dependancies are missing, and none have
* a modification time after 'obj_time', the function will return 0. Otherwise
* 1 is returned denoting a rebuild may be required.
*/
static int check_obj_deps(char *src, time_t obj_time)
{
static char dep[64];
char *buf;
int bufsize;
struct stat statbuf;
char *ptr = obj;
FILE *df;
size_t i;
ptr = strrchr(src, '/');
if(!ptr) ptr = src;
ptr = strrchr(ptr, '.');
if(ptr) *ptr = 0;
snprintf(dep, sizeof(dep), "%s/%s%s", getvar("DEP_DIR"), src,
getvar("DEP_EXT"));
if(ptr) *ptr = '.';
df = fopen(dep, "r");
if(!df)
{
if(stat(src, &statbuf) != 0 || statbuf.st_mtime > obj_time)
return 1;
return 0;
}
fseek(df, 0, SEEK_END);
bufsize = ftell(df)+1;
buf = malloc(bufsize);
if(!buf)
{
fclose(df);
return 1;
}
fseek(df, 0, SEEK_SET);
i = 0;
while(fgets(buf+i, bufsize-i, df) != NULL)
{
i = strlen(buf);
if(buf[i-1] != '\\')
break;
}
fclose(df);
ptr = strchr(buf, ':');
if(!ptr)
{
free(buf);
return 1;
}
++ptr;
while(1)
{
char *stp;
while(*ptr && isspace(*ptr))
{
if(*ptr == '\n')
{
free(buf);
return 0;
}
++ptr;
}
if(!(*ptr))
{
free(buf);
return 0;
}
stp = ptr;
while(*stp && !isspace(*stp))
{
if(*stp == '\\')
memmove(stp, stp+1, strlen(stp));
++stp;
}
*(stp++) = 0;
if(strcmp(ptr, "\n") != 0 && (stat(ptr, &statbuf) != 0 ||
statbuf.st_mtime > obj_time))
{
free(buf);
return 1;
}
ptr = stp;
}
}
/* copy_file: Copies the source file 'sf' to 'df', preserving the source's
* file mode and permissions, if possible.
*/
static int copy_file(const char *sf, const char *df)
{
struct stat statbuf;
FILE *src, *dst;
int ret, i;
int fd;
if(stat(sf, &statbuf) != 0)
return 1;
fd = open(df, O_WRONLY|O_TRUNC|O_CREAT, statbuf.st_mode);
if(fd < 0)
return 1;
dst = fdopen(fd, "wb");
if(!dst)
{
close(fd);
return 1;
}
src = fopen(sf, "rb");
if(!src)
{
fclose(dst);
return 1;
}
ret = 0;
do {
i = fread(buffer, 1, sizeof(buffer), src);
if(i > 0)
i = fwrite(buffer, 1, i, dst);
if(i < 0)
ret = 1;
} while(i > 0);
fclose(src);
fclose(dst);
return ret;
}
/* extract_word: Extract a word starting at the string pointed to by 'str'. If
* the word begins with a ' or " character, everything until that same
* character will be considered part of the word. Otherwise, the word ends at
* the first encountered whitespace. Returns the beginning of the next word,
* or the end of the string.
*/
static char *extract_word(char **str)
{
char *end;
char c;
c = **str;
if(c == '"' || c == '\'')
{
++(*str);
end = *str;
while(*end)
{
if(*end == c)
break;
++end;
}
}
else
{
end = *str;
while(!isspace(*end) && *end)
++end;
}
if(*end) *(end++) = 0;
while(isspace(*end) && *end)
++end;
return end;
}
/* build_obj_list: Builds a list of object files from the list of sources. If
* any of the objects don't exist or have a modification time later than
* 'base_time', the variable pointed to by 'do_link' will be set non-zero.
*/
static int build_obj_list(char *buffer, size_t bufsize, time_t base_time,
int *do_link)
{
static char buf[64];
struct stat statbuf;
char *next = sources;
char *ptr;
int i = 0;
while(*(ptr=next))
{
char *ext;
char c = ' ';
next = extract_word(&ptr);
if(ptr > sources)
{
c = *(ptr-1);
if(c != '"' && c != '\'')
c = ' ';
}
ext = strrchr(ptr, '/');
if(!ext) ext = ptr;
ext = strrchr(ext, '.');
if(ext) *ext = 0;
snprintf(buf, sizeof(buf), "%s/%s%s", getvar("OBJ_DIR"), ptr,
getvar("OBJ_EXT"));
if(ext) *ext = '.';
if(!(*do_link) && (stat(buf, &statbuf) != 0 ||
base_time < statbuf.st_mtime))
*do_link = 1;
i += snprintf(buffer+i, bufsize-i, " \"%s\"", buf);
ptr += strlen(ptr);
if(next > ptr)
*ptr = c;
}
return i;
}
static int libify_name(char *buf, size_t buflen, char *name)
{
int i;
char *curr = strrchr(name, '/');
if(curr)
{
*curr = 0;
i = snprintf(buf, buflen, "%s/%s%s%s", name, getvar("LIB_PRE"),
curr+1, getvar("LIB_EXT"));
*curr = '/';
}
else
i = snprintf(buf, buflen, "%s%s%s", getvar("LIB_PRE"), name,
getvar("LIB_EXT"));
return i;
}
static char *strrpbrk(char *str, char *brk, int len)
{
char *ptr = str+len;
while((--ptr) >= str)
{
char *c = brk;
while(*c)
{
if(*(c++) == *ptr)
return ptr;
}
}
return NULL;
}
int main(int argc, char **argv)
{
FILE *f;
int do_level = 0, wait_for_done = 0;
int did_cmds = 0, did_else = 0;
int curr_line = 0;
char *ptr, *nextline = NULL, *nextcmd = NULL;
int ret = 0, tmp = 0, i;
int ignored_errors = 0;
int verbose = 0;
int shh;
setenv("CC", "gcc", 0);
setenv("CXX", "g++", 0);
setenv("LD", "gcc", 0);
setenv("OUT_OPT", "-o ", 0);
setenv("SRC_OPT", "-c ", 0);
setenv("DEP_OPT", "-MMD -MF ", 0);
setenv("OBJ_EXT", ".o", 0);
setenv("OBJ_DIR", ".", 0);
setenv("DEP_EXT", ".d", 0);
setenv("DEP_DIR", ".", 0);
#ifdef _WIN32
setenv("EXE_EXT", ".exe", 0);
#else
setenv("EXE_EXT", "", 0);
#endif
setenv("AR", "ar", 0);
setenv("AR_OPT", "", 0);
setenv("LIB_PRE", "lib", 0);
setenv("LIB_EXT", ".a", 0);
setenv("CPPFLAGS", "", 0);
setenv("CFLAGS", "", 0);
setenv("CXXFLAGS", "", 0);
setenv("LDFLAGS", "", 0);
/* Open the default file */
f = fopen("default.cbd", "r");
if(!f)
{
fprintf(stderr, "\n\n\n*** Critical Error ***\n"
"Could not open 'default.cbd'!\n\n");
exit(1);
}
main_loop_start:
while(1)
{
int line_count, len;
int ignore_err = 0;
int in_quote = 0;
int has_do = 0;
int reverse;
/* If we already have the next line set, go do it */
if(nextcmd)
{
memmove(linebuf, nextcmd, strlen(nextcmd)+1);
nextcmd = NULL;
goto reparse;
}
/* If we already have the next line set, go do it */
if(nextline)
{
memmove(linebuf, nextline, strlen(nextline)+1);
nextline = NULL;
goto reparse;
}
/* Grab the next line and increment the line count */
if(fgets(linebuf, sizeof(linebuf), f) == NULL)
{
if(!invoke_backup[0].f)
break;
/* If end of file, check if we should uninvoke and continue */
for(i = 1;i <= INVOKE_BKP_SIZE;++i)
{
if(i == INVOKE_BKP_SIZE || !invoke_backup[i].f)
{
--i;
fclose(f);
f = invoke_backup[i].f;
invoke_backup[i].f = NULL;
strcpy(linebuf, invoke_backup[i].bkp_lbuf);
free(invoke_backup[i].bkp_lbuf);
if(invoke_backup[i].bkp_nextline)
{
nextline = linebuf+strlen(linebuf)+1;
strcpy(nextline, invoke_backup[i].bkp_nextline);
free(invoke_backup[i].bkp_nextline);
}
curr_line = invoke_backup[i].bkp_line;
did_else = invoke_backup[i].bkp_did_else;
did_cmds = invoke_backup[i].bkp_did_cmds;
do_level = invoke_backup[i].bkp_do_level;
goto main_loop_start;
}
}
break;
}
++curr_line;
line_count = 0;
ptr = linebuf;
do {
while((ptr=strpbrk(ptr, "$'\"#")) != NULL)
{
/* Enter in-quote mode (disables ''-quoting and #-comments) */
if(*ptr == '\"')
{
in_quote ^= 1;
++ptr;
continue;
}
/* A '#' kills the rest of the line */
if(*ptr == '#' && !in_quote)
{
char *next = strchr(ptr, '\n');
if(next)
memmove(ptr, next, strlen(next)+1);
else
*ptr = 0;
continue;
}
/* Jump past a hard quote (don't expand anything) */
if(*ptr == '\'' && !in_quote)
{
int add_count = 0;
char *next = strchr(ptr+1, '\'');
/* Find the closing '. If it's not found, assume it's a
* multi-line quote */
while(!next)
{
next = ptr+strlen(ptr);
if(sizeof(linebuf) == next-linebuf)
{
printf("!!! Error, line %d !!!\n"
"Unterminated hard quote!", curr_line);
ret = -1;
goto end;
}
if(fgets(next, sizeof(linebuf)-(next-linebuf), f) ==
NULL)
break;
next = strchr(ptr+1, '\'');
++add_count;
}
ptr = next;
curr_line += add_count;
++ptr;
continue;
}
/* Apend the next line to this one */
if(strcmp(ptr, "$\n") == 0)
{
ptr += 2;
if(fgets(ptr, sizeof(linebuf)-(ptr-linebuf), f) == NULL)
break;
++curr_line;
continue;
}
++ptr;
}
if(!in_quote)
break;
ptr = linebuf+strlen(linebuf);
if(fgets(ptr, sizeof(linebuf)-(ptr-linebuf), f) == NULL)
{
printf("!!! Error, line %d !!!\n"
"Unterminated quote!", curr_line);
ret = -1;
goto end;
}
++line_count;
} while(1);
curr_line += line_count;
/* Check for the special '$' char, expanding variables as needed */
do {
len = strlen(linebuf);
in_quote = 0;
tmp = 0;
ptr = linebuf;
while((ptr=strrpbrk(linebuf, "$'\"", len)) != NULL)
{
len = ptr-linebuf;
/* Enter in-quote mode (disables ''-quoting and #-comments) */
if(*ptr == '\"')
{
in_quote ^= 1;
continue;
}
/* A '#' kills the rest of the line */
if(*ptr == '#' && !in_quote)
{
char *next = strchr(ptr, '\n');
if(next)
memmove(ptr, next, strlen(next)+1);
else
*ptr = 0;
continue;
}
/* Jump past a hard quote (don't expand anything) */
if(*ptr == '\'' && !in_quote)
{
char *next;
*ptr = 0;
next = strrchr(linebuf, '\'');
if(!next)
{
printf("!!! Error, line %d !!!\n"
"Unterminated hard quote!", curr_line);
ret = -1;
goto end;
}
*ptr = '\'';
len = next-linebuf;
continue;
}
++ptr;
/* Insert the environment var named between the {} */
if(*ptr == '{')
{
char *end = strchr(ptr, '}');
if(!end)
end = ptr+strlen(ptr);
else
*(end++) = 0;
*(--ptr) = 0;
snprintf(buffer, sizeof(buffer), "%s%s%s", linebuf,
getvar(ptr+2), end);
strcpy(linebuf, buffer);
tmp = 1;
continue;
}
/* Run a special command, replacing the section */
if(*ptr == '(')
{
char *next = strchr(ptr, ')'), *opt;
if(!next)
continue;
tmp = 1;
*(ptr-1) = 0;
*(next++) = 0;
++ptr;
opt = extract_word(&ptr);
/* Replaces the section with the specified command line
* option's value (in the format 'option=value') */
if(strcasecmp(ptr, "getoptval") == 0)
{
const char *val = "";
int len;
len = snprintf(buffer, sizeof(buffer), "%s=", opt);
for(i = 1;i < argc;++i)
{
if(strncasecmp(buffer, argv[i], len) == 0)
{
val = argv[i]+len;
break;
}
}
snprintf(buffer, sizeof(buffer), "%s%s%s", linebuf,
val, next);
strcpy(linebuf, buffer);
continue;
}
/* Returns a library-style name from the specified
* filename */
if(strcasecmp(ptr, "libname") == 0)
{
libify_name(obj, sizeof(obj), opt);
snprintf(buffer, sizeof(buffer), "%s%s%s", linebuf,
obj, next);
strcpy(linebuf, buffer);
continue;
}
if(strcasecmp("ifeq", ptr) == 0)
{
char *var2;
char *val;
var2 = strchr(opt, ',');
if(!var2)
{
printf("\n\n!!! Error, line %d !!!\n"
"Malformed 'ifeq' sub-command!\n\n",
curr_line);
ret = 1;
goto end;
}
*(var2++) = 0;
val = strchr(var2, ',');
if(!val)
{
printf("\n\n!!! Error, line %d !!!\n"
"Malformed 'ifeq' sub-command!\n\n",
curr_line);
ret = 1;
goto end;
}
*(val++) = 0;
if(strcmp(opt, var2) == 0)
{
char *sep = strchr(val, ',');
if(sep) *sep = 0;
}
else
{
val = strchr(val, ',');
if(val) ++val;
}
snprintf(buffer, sizeof(buffer), "%s%s%s", linebuf,
(val?val:""), next);
strcpy(linebuf, buffer);
continue;
}
printf("\n\n!!! Error, line %d !!!\n"
"Unknown sub-command '%s'\n\n", curr_line, ptr);
goto end;
}
}
} while(tmp);
/* Now check for '$'-escapes */
ptr = linebuf;
while((ptr=strpbrk(ptr, "$'\"")) != NULL)
{
if(*ptr == '"')
{
ptr = strchr(ptr+1, '"');
if(!ptr)
break;
continue;
}
if(*ptr == '\'' && !in_quote)
{
ptr = strchr(ptr+1, '\'');
if(!ptr)
break;
continue;
}
++ptr;
/* Just a normal "escaped" character, pull the rest of the line
* back one. '$\n' will be handled later */
if(*ptr != '\n')
memmove(ptr-1, ptr, strlen(ptr)+1);
else
++ptr;
}
reparse:
reverse = 0;
shh = 0;
/* Get the next line */
if(!nextline)
{
int in_quotes = 0;
nextline = linebuf;
while(*nextline && *nextline != '\n')
{
if(*nextline == '"')
in_quotes ^= 1;
if(!in_quotes)
{
if(*nextline == '\'')
{
nextline = strchr(nextline+1, '\'');
if(!nextline)
break;
}
if(nextline[0] == '$' && nextline[1] == '\n')
memmove(nextline, nextline+1, strlen(nextline));
}
++nextline;
}
if(nextline)
{
if(*nextline)
*(nextline++) = 0;
if(!(*nextline))
nextline = NULL;
}
}
/* Chew up leading whitespace */
for(i = 0;linebuf[i];++i)
{
if(!isspace(linebuf[i]))
{
if(i > 0)
{
memmove(linebuf, linebuf+i, strlen(linebuf)+1-i);
i = 0;
}
break;
}
}
if(!linebuf[i])
continue;
/* Find the end of the command name */
ptr = linebuf;
while(*ptr && !isspace(*ptr))
++ptr;
if(*ptr)
{
/* If found, NULL it and get the beginning of the option */
tmp = *ptr;
*(ptr++) = 0;
while(isspace(*ptr) && *ptr)
++ptr;
}
/* Check for special 'level'ing commands */
/* The 'do' command pushes us up a level, and checks for the next
* if-type command, which itself will let us know if we should start
* ignoring commands */
if(strcasecmp("do", linebuf) == 0)
{
has_do = 1;
++do_level;
memmove(linebuf, ptr, strlen(ptr)+1);
goto reparse;
}
/* 'else' toggles ignoring commands at the current level */
if(strcasecmp("else", linebuf) == 0)
{
if(do_level <= 0)
{
fprintf(stderr, "\n\n!!! Error, line %d !!!\n"
"'else' statement encountered without 'do'!\n",
curr_line);
goto end;
}
/* TODO: allow another if-type command to follow an else on the
* same level */
if(!(wait_for_done & (1<<(do_level-1))))
{
wait_for_done |= 1<<(do_level-1);
did_cmds |= 1<<(do_level-1);
has_do = 0;
}
if(!(did_cmds & (1<<(do_level-1))))
{
wait_for_done &= ~(1<<(do_level-1));
has_do = 1;
}
memmove(linebuf, ptr, strlen(ptr)+1);
goto reparse;
}
/* 'done' takes us down a level */
if(strcasecmp("done", linebuf) == 0)
{
if(do_level <= 0)
{
fprintf(stderr, "\n\n!!! Error, line %d !!!\n"
"'done' statement encountered without 'do'!\n",
curr_line);
goto end;
}
wait_for_done &= ~(1<<(--do_level));
did_else &= ~(1<<do_level);
did_cmds &= ~(1<<do_level);
continue;
}
if((wait_for_done & ((1<<do_level)-1)))
continue;
/* Set an environment variable. The value is space sensitive, so if you
* wish to use spaces, encapsulate the value in ''s. Using '?=' instead
* of '=' will only set the variable if it isn't already set. */
if(strchr(linebuf, '=') > linebuf || strncmp(ptr, "+=", 2) == 0 ||
strncmp(ptr, "-=", 2) == 0 || strncmp(ptr, "?=", 2) == 0 ||
ptr[0] == '=')
{
char *val = strchr(linebuf, '=');
int ovr = 1;
if(!val)
{
val = ptr;
if(val[0] != '=')
++val;
}
ptr = linebuf;
/* Restore stolen space */
ptr[strlen(ptr)] = tmp;
if(*(val-1) == '+')
{
*(val-1) = 0;
++val;
while(*val && isspace(*val))
++val;
extract_word(&ptr);
extract_word(&val);
if(*val)
{
snprintf(buffer, sizeof(buffer), "%s%s", getvar(ptr), val);
setenv(ptr, buffer, 1);
}
continue;
}
if(*(val-1) == '-')
{
char *pos;
int len;
*(val-1) = 0;
++val;
while(*val && isspace(*val))
++val;
extract_word(&ptr);
extract_word(&val);
len = strlen(val);
snprintf(buffer, sizeof(buffer), "%s", getvar(ptr));
while((pos=strstr(buffer, val)) != NULL)
{
int len = strlen(val);
memmove(pos, pos+len, strlen(pos+len)+1);
}
setenv(ptr, buffer, 1);
continue;
}
if(*(val-1) == '?')
{
*(val-1) = 0;
++val;
extract_word(&ptr);
if(*getvar(ptr))
ovr = 0;
}
else
{
*(val++) = 0;
extract_word(&ptr);
}
while(*val && isspace(*val))
++val;
extract_word(&val);
if(*val)
setenv(ptr, val, ovr);
else if(ovr)
unsetenv(ptr);
continue;
}
if(!(*ptr))
{
fprintf(stderr, "Malformed command, line #%d: '%s'\n", curr_line,
linebuf);
continue;
}
/* The if command checks if 'val1 = val2' is true and processes the
* rest of the line if so. */
if(strcasecmp("if", linebuf) == 0)
value_check:
{
char *next, *var2 = ptr;
var2 = extract_word(&ptr);
var2 = strchr(var2, '=');
if(!var2)
{
printf("\n\n!!! Error, line %d !!!\n"
"Malformed 'if' command!\n\n", curr_line);
ret = 1;
goto end;
}
*(var2++) = 0;
while(*var2 && isspace(*var2))
++var2;
extract_word(&ptr);
next = extract_word(&var2);
if(strcmp(ptr, var2) == 0)
nextcmd = next;
if(reverse)
nextcmd = (char*)((long)nextcmd ^ (long)next);
if(has_do)
wait_for_done |= (nextcmd?0:1)<<(do_level-1);
continue;
}
/* Same as above, except if the comparison is false or it equates 0 */
if(strcasecmp("ifnot", linebuf) == 0)
{
reverse = 1;