ctl

commit 09a6ec4d59f4030a1b1ff7a7b2646eb5292d47b3
Author: Sophie <info@soophie.de>
Date:   Sat, 14 Dec 2024 22:54:45 +0000

feat: Initial commit

Diffstat:
A
Makefile
 | 
13
+++++++++++++
A
README.md
 | 
3
+++
A
src/main.c
 | 
177
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

3 files changed, 193 insertions(+), 0 deletions(-)
diff --git a/Makefile b/Makefile
@@ -0,0 +1,13 @@
+CC=cc
+CFLAGS=-Wall -Wextra -Werror -pedantic
+LIBS=
+
+build: src/*.c
+	$(CC) -o ctl $(CLFAGS) $(LIBS) $^
+
+install: build
+	cp ctl /usr/local/bin/
+	rm ./ctl
+
+clean:
+	rm ./ctl
diff --git a/README.md b/README.md
@@ -0,0 +1,3 @@
+# ctl
+
+Static template generator for C
diff --git a/src/main.c b/src/main.c
@@ -0,0 +1,177 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define LIB_STR_IMPL
+#include <libstr.h>
+
+typedef enum {
+  CTL_ERR_OK,
+  CTL_ERR_NO_ARGS,
+  CTL_ERR_NO_FILE,
+  CTL_ERR_UNCLOSED_CODE,
+} ctl_error_t;
+
+void ctl_error_str(ctl_error_t err) {
+  switch (err) {
+    case CTL_ERR_OK:
+      break;
+    case CTL_ERR_NO_ARGS:
+      printf("Usage: ctl <filename>\n");
+      break;
+    case CTL_ERR_NO_FILE:
+      printf("Error: No file found!\n");
+      break;
+    case CTL_ERR_UNCLOSED_CODE:
+      printf("Error: Unclosed code block!\n");
+      break;
+  }
+}
+
+char *str_replace_all_len(char *buffer, char *str, char *replacement, int len) {
+  char *ret = NULL;
+  int str_len = strlen(str);
+  for (int i = 0; i < len; i++) {
+    char *ptr = &buffer[i];
+    if (strncmp(ptr, str, str_len) == 0) {
+      str_append(&ret, replacement);
+      i += str_len - 1;
+    }
+    else {
+      str_append_len(&ret, &buffer[i], 1);
+    }
+  }
+  return ret;
+}
+
+char *str_hex_len(char *str, int len) {
+  const int HEX = 4;
+  char *ret = calloc(HEX * len + 1, sizeof(char));
+  for (int i = 0; i < len; i++) {
+    unsigned char hex = str[i] & 0xff;
+    snprintf(ret + HEX * i, HEX * len, "\\x%02x", hex);
+  }
+  ret[HEX * len] = '\0';
+  return ret;
+}
+
+ctl_error_t ctl_render(char **template, char *content) {
+  int len = strlen(content);
+  int set = 0;
+  int is_code = 0;
+  str_append(template, "{\n");
+  for (int i = 0; i < len; i++) {
+    if (content[i] == '%') {
+      // ignore escaped %
+      if (i + 1 < len && content[i + 1] == '%') {
+        i += 1;
+        continue;
+      }
+      if (is_code) {
+        str_append_len(template, content + set, i - set);
+        str_append(template, "\n");
+      }
+      else {
+        const int STRING_LIMIT = 4095;
+        int str_len = i - set;
+        int rem_len = str_len;
+        int hex_len = 0;
+        int idx = 0;
+        while (rem_len > 0) {
+          if (rem_len > STRING_LIMIT) {
+            hex_len = STRING_LIMIT;
+          }
+          else {
+            hex_len = str_len - idx;
+          }
+          rem_len -= hex_len;
+          char *str = str_replace_all_len(content + set + idx, "%%", "%", hex_len);
+          char *hex = str_hex_len(str, strlen(str));
+          str_append(template, "CTL_OUT(ctl_out, \"");
+          str_append(template, hex);
+          str_append(template, "\");\n");
+          free(str);
+          free(hex);
+          idx += hex_len;
+        }
+      }
+      is_code = !is_code;
+      set = i + 1;
+    }
+  }
+  if (is_code) {
+    return CTL_ERR_UNCLOSED_CODE;
+  }
+  else {
+    const int STRING_LIMIT = 4095;
+    int str_len = len - set;
+    int rem_len = str_len;
+    int hex_len = 0;
+    int idx = 0;
+    while (rem_len > 0) {
+      if (rem_len > STRING_LIMIT) {
+        hex_len = STRING_LIMIT;
+      }
+      else {
+        hex_len = str_len - idx;
+      }
+      rem_len -= hex_len;
+      char *str = str_replace_all_len(content + set + idx, "%%", "%", hex_len);
+      char *hex = str_hex_len(str, strlen(str));
+      str_append(template, "CTL_OUT(ctl_out, \"");
+      str_append(template, hex);
+      str_append(template, "\");\n");
+      free(str);
+      free(hex);
+      idx += hex_len;
+    }
+  }
+  str_append(template, "}\n");
+  *template = str_replace_all(*template, "%%", "%");
+  return CTL_ERR_OK;
+}
+
+ctl_error_t ctl_file_read(char **content, const char *filename) {
+  FILE *fp = fopen(filename, "r");
+  if (fp == NULL) {
+    return CTL_ERR_NO_FILE;
+  }
+  fseek(fp, 0, SEEK_END);
+  int len = ftell(fp);
+  fseek(fp, 0, SEEK_SET);
+  *content = calloc(len + 1, sizeof(char));
+  fread(*content, sizeof(char), len, fp);
+  (*content)[len] = '\0';
+  fclose(fp);
+  return CTL_ERR_OK;
+}
+
+int main(int argc, char **argv) {
+  ctl_error_t err;
+  if (argc < 2) {
+    err = CTL_ERR_NO_ARGS;
+    ctl_error_str(err);
+    return err;
+  }
+  char *filename = argv[1];
+  char *content = NULL;
+  err = ctl_file_read(&content, filename);
+  if (err != CTL_ERR_OK) {
+    ctl_error_str(err);
+    return err;
+  }
+  char *template = NULL;
+  err = ctl_render(&template, content);
+  if (err != CTL_ERR_OK) {
+    ctl_error_str(err);
+    free(content);
+    if (template != NULL) {
+      free(template);
+    }
+    return err;
+  }
+  printf("%s\n", template);
+  free(template);
+  free(content);
+  return CTL_ERR_OK;
+}