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nothings-stb/stb_include.h

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// stb_include.h - v0.01 - parse and process #include directives - public domain
//
// To build this, in one source file that includes this file do
// #define STB_INCLUDE_IMPLEMENTATION
//
// This program parses a string and replaces lines of the form
// #include "foo"
// with the contents of a file named "foo". It also embeds the
// appropriate #line directives. Note that all include files must
// reside in the location specified in the path passed to the API;
// it does not check multiple directories.
//
// If the string contains a line of the form
// #inject
// then it will be replaced with the contents of the string 'inject' passed to the API.
//
// Options:
//
// Define STB_INCLUDE_LINE_GLSL to get GLSL-style #line directives
// which use numbers instead of filenames.
//
// Define STB_INCLUDE_LINE_NONE to disable output of #line directives.
//
// Standard libraries:
//
// stdio.h FILE, fopen, fclose, fseek, ftell
// stdlib.h malloc, realloc, free
// string.h strcpy, strncmp, memcpy
#ifndef STB_INCLUDE_STB_INCLUDE_H
#define STB_INCLUDE_STB_INCLUDE_H
// Do include-processing on the string 'str'. To free the return value, pass it to free()
char *stb_include_string(char *str, char *inject, char *path_to_includes, char *filename_for_line_directive, char error[256]);
// Concatenate the strings 'strs' and do include-processing on the result. To free the return value, pass it to free()
char *stb_include_strings(char **strs, int count, char *inject, char *path_to_includes, char *filename_for_line_directive, char error[256]);
// Load the file 'filename' and do include-processing on the string therein. note that
// 'filename' is opened directly; 'path_to_includes' is not used. To free the return value, pass it to free()
char *stb_include_file(char *filename, char *inject, char *path_to_includes, char error[256]);
#endif
#ifdef STB_INCLUDE_IMPLEMENTATION
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static char *stb_include_load_file(char *filename, size_t *plen)
{
char *text;
size_t len;
FILE *f = fopen(filename, "rb");
if (f == 0) return 0;
fseek(f, 0, SEEK_END);
len = (size_t) ftell(f);
if (plen) *plen = len;
text = (char *) malloc(len+1);
if (text == 0) return 0;
fseek(f, 0, SEEK_SET);
fread(text, 1, len, f);
fclose(f);
text[len] = 0;
return text;
}
typedef struct
{
int offset;
int end;
char *filename;
int next_line_after;
} include_info;
static include_info *stb_include_append_include(include_info *array, int len, int offset, int end, char *filename, int next_line)
{
include_info *z = (include_info *) realloc(array, sizeof(*z) * (len+1));
z[len].offset = offset;
z[len].end = end;
z[len].filename = filename;
z[len].next_line_after = next_line;
return z;
}
static void stb_include_free_includes(include_info *array, int len)
{
int i;
for (i=0; i < len; ++i)
free(array[i].filename);
free(array);
}
static int stb_include_isspace(int ch)
{
return (ch == ' ' || ch == '\t' || ch == '\r' || ch == 'n');
}
// find location of all #include and #inject
static int stb_include_find_includes(char *text, include_info **plist)
{
int line_count = 1;
int inc_count = 0;
char *s = text, *start;
include_info *list = NULL;
while (*s) {
// parse is always at start of line when we reach here
start = s;
while (*s == ' ' || *s == '\t')
++s;
if (*s == '#') {
++s;
while (*s == ' ' || *s == '\t')
++s;
if (0==strncmp(s, "include", 7) && stb_include_isspace(s[7])) {
s += 7;
while (*s == ' ' || *s == '\t')
++s;
if (*s == '"') {
char *t = ++s;
while (*t != '"' && *t != '\n' && *t != '\r' && *t != 0)
++t;
if (*t == '"') {
char *filename = (char *) malloc(t-s+1);
memcpy(filename, s, t-s);
filename[t-s] = 0;
s=t;
while (*s != '\r' && *s != '\n' && *s != 0)
++s;
// s points to the newline, so s-start is everything except the newline
list = stb_include_append_include(list, inc_count++, start-text, s-text, filename, line_count+1);
}
}
} else if (0==strncmp(s, "inject", 6) && (stb_include_isspace(s[6]) || s[6]==0)) {
while (*s != '\r' && *s != '\n' && *s != 0)
++s;
list = stb_include_append_include(list, inc_count++, start-text, s-text, NULL, line_count+1);
}
}
while (*s != '\r' && *s != '\n' && *s != 0)
++s;
if (*s == '\r' || *s == '\n') {
s = s + (s[0] + s[1] == '\r' + '\n' ? 2 : 1);
}
++line_count;
}
*plist = list;
return inc_count;
}
// avoid dependency on sprintf()
static void stb_include_itoa(char str[9], int n)
{
int i;
for (i=0; i < 8; ++i)
str[i] = ' ';
str[i] = 0;
for (i=1; i < 8; ++i) {
str[7-i] = '0' + (n % 10);
n /= 10;
if (n == 0)
break;
}
}
static char *stb_include_append(char *str, size_t *curlen, char *addstr, size_t addlen)
{
str = (char *) realloc(str, *curlen + addlen);
memcpy(str + *curlen, addstr, addlen);
*curlen += addlen;
return str;
}
char *stb_include_string(char *str, char *inject, char *path_to_includes, char *filename, char error[256])
{
char temp[4096];
include_info *inc_list;
int i, num = stb_include_find_includes(str, &inc_list);
size_t source_len = strlen(str);
char *text=0;
size_t textlen=0, last=0;
for (i=0; i < num; ++i) {
text = stb_include_append(text, &textlen, str+last, inc_list[i].offset - last);
// write out line directive for the include
#ifndef STB_INCLUDE_LINE_NONE
#ifdef STB_INCLUDE_LINE_GLSL
if (textlen != 0) // GLSL #version must appear first, so don't put a #line at the top
#endif
{
strcpy(temp, "#line ");
stb_include_itoa(temp+6, 1);
strcat(temp, " ");
#ifdef STB_INCLUDE_LINE_GLSL
stb_include_itoa(temp+15, i+1);
#else
strcat(temp, "\"");
if (inc_list[i].filename == 0)
strcmp(temp, "INJECT");
else
strcat(temp, inc_list[i].filename);
strcat(temp, "\"");
#endif
strcat(temp, "\n");
text = stb_include_append(text, &textlen, temp, strlen(temp));
}
#endif
if (inc_list[i].filename == 0) {
if (inject != 0)
text = stb_include_append(text, &textlen, inject, strlen(inject));
} else {
char *inc;
strcpy(temp, path_to_includes);
strcat(temp, "/");
strcat(temp, inc_list[i].filename);
inc = stb_include_file(temp, inject, path_to_includes, error);
if (inc == NULL) {
stb_include_free_includes(inc_list, num);
return NULL;
}
text = stb_include_append(text, &textlen, inc, strlen(inc));
free(inc);
}
// write out line directive
#ifndef STB_INCLUDE_LINE_NONE
strcpy(temp, "\n#line ");
stb_include_itoa(temp+6, inc_list[i].next_line_after);
strcat(temp, " ");
#ifdef STB_INCLUDE_LINE_GLSL
stb_include_itoa(temp+15, 0);
#else
strcat(temp, filename != 0 ? filename : "source-file");
#endif
text = stb_include_append(text, &textlen, temp, strlen(temp));
// no newlines, because we kept the #include newlines, which will get appended next
#endif
last = inc_list[i].end;
}
text = stb_include_append(text, &textlen, str+last, source_len - last + 1); // append '\0'
stb_include_free_includes(inc_list, num);
return text;
}
char *stb_include_strings(char **strs, int count, char *inject, char *path_to_includes, char *filename, char error[256])
{
char *text;
char *result;
int i;
size_t length=0;
for (i=0; i < count; ++count)
length += strlen(strs[i]);
text = (char *) malloc(length+1);
length = 0;
for (i=0; i < count; ++count) {
strcpy(text + length, strs[i]);
length += strlen(strs[i]);
}
result = stb_include_string(text, inject, path_to_includes, filename, error);
free(text);
return result;
}
char *stb_include_file(char *filename, char *inject, char *path_to_includes, char error[256])
{
size_t len;
char *result;
char *text = stb_include_load_file(filename, &len);
if (text == NULL) {
strcpy(error, "Error: couldn't load '");
strcat(error, filename);
strcat(error, "'");
return 0;
}
result = stb_include_string(text, inject, path_to_includes, filename, error);
free(text);
return result;
}
#if 0 // @TODO, GL_ARB_shader_language_include-style system that doesn't touch filesystem
char *stb_include_preloaded(char *str, char *inject, char *includes[][2], char error[256])
{
}
#endif
#endif // STB_INCLUDE_IMPLEMENTATION
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