Initial submission

Makefile

@@ -0,0 +1,15 @@
+CROSS_COMPILE ?= 
+CC := $(CROSS_COMPILE)gcc
+STRIP := $(CROSS_COMPILE)strip
+AR := $(CROSS_COMPILE)ar
+CFLAGS += -g -Wall
+DLIB = libconf.so
+SLIB = libconf.a
+
+all: libconf.o
+	$(CC) $(CFLAGS) -FPIC -shared $^ -o $(DLIB)
+	$(AR) -rc $(SLIB) $^
+
+clean:
+	rm -rf *.o
+	rm $(DLIB) $(SLIB)

README.md

@@ -0,0 +1,11 @@
+# libconf
+    非常小的读取conf配置文件c库,修改自CProxy.
+    
+# build
+    git clone https://github.com/niuyuling/libconf
+    cd libconf
+    make
+
+# test
+    gcc -Wall test.c -o test -L./ -lconf -static
+    ./test

libconf.c

@@ -0,0 +1,145 @@
+#include "libconf.h"
+
+/* 在content中，设置变量(var)的首地址，值(val)的位置首地址和末地址，返回下一行指针 */
+static char *set_var_val_lineEnd(char *content, char **var, char **val_begin, char **val_end)
+{
+
+    char *p, *pn, *lineEnd;
+    ;
+    int val_len;
+
+    while (1)
+    {
+        if (content == NULL)
+            return NULL;
+
+        for (;*content == ' ' || *content == '\t' || *content == '\r' || *content == '\n'; content++);
+        if (*content == '\0')
+            return NULL;
+        *var = content;
+        pn = strchr(content, '\n');
+        p = strchr(content, '=');
+        if (p == NULL)
+        {
+            if (pn)
+            {
+                content = pn + 1;
+                continue;
+            }
+            else
+                return NULL;
+        }
+        content = p;
+        //将变量以\0结束
+        for (p--; *p == ' ' || *p == '\t'; p--);
+        *(p+1) = '\0';
+        //值的首地址
+        for (content++; *content == ' ' || *content == '\t'; content++);
+        if (*content == '\0')
+            return NULL;
+        //双引号引起来的值支持换行
+        if (*content == '"')
+        {
+            *val_begin = content + 1;
+            *val_end = strstr(*val_begin, "\";");
+            if (*val_end != NULL)
+                break;
+        }
+        else
+            *val_begin = content;
+        *val_end = strchr(content, ';');
+        if (pn && *val_end > pn)
+        {
+            content = pn + 1;
+            continue;
+        }
+        break;
+    }
+
+    if (*val_end)
+    {
+        **val_end = '\0';
+        val_len = *val_end - *val_begin;
+        lineEnd = *val_end;
+    }
+    else
+    {
+        val_len = strlen(*val_begin);
+        *val_end = lineEnd = *val_begin + val_len;
+    }
+    *val_end = *val_begin + val_len;
+    //printf("var[%s]\nbegin[%s]\n\n", *var, *val_begin);
+    return lineEnd;
+}
+
+static char *parse_global_module(char *content, char *key)
+{
+    char *var, *val_begin, *val_end, *lineEnd;
+    int val_begin_len;
+    
+    while ((lineEnd = set_var_val_lineEnd(content, &var, &val_begin, &val_end)) != NULL)
+    {
+        if (strcasecmp(var, key) == 0) {
+            //printf("%s\n", val_begin);
+            return val_begin;
+        }
+        content = strchr(lineEnd+1, '\n');
+    }
+    return NULL;
+}
+
+/* 在buff中读取模块(global http https httpdns httpudp)内容 */
+static char *read_module(char *buff, const char *module_name)
+{
+    int len;
+    char *p, *p0;
+
+    len = strlen(module_name);
+    p = buff;
+    while (1)
+    {
+        while (*p == ' ' || *p == '\t' || *p == '\r' || *p == '\n')
+            p++;
+        if (strncasecmp(p, module_name, len) == 0)
+        {
+            p += len;
+            while (*p == ' ' || *p == '\t' || *p == '\r' || *p == '\n')
+                p++;
+            if (*p == '{')
+                break;
+        }
+        if ((p = strchr(p, '\n')) == NULL)
+            return NULL;
+    }
+    
+    if ((p0 = strchr(++p, '}')) == NULL)
+        return NULL;
+    return strndup(p, p0 - p);
+}
+
+char *read_conf(char *filename, char *module, char *key)
+{
+    char *buff, *global_content;
+    FILE *file;
+    long file_size;
+
+    file = fopen(filename, "r");
+    if (file == NULL)
+        perror("cannot open config file.");
+    fseek(file, 0, SEEK_END);
+    file_size = ftell(file);
+    buff = (char *)alloca(file_size + 1);
+    if (buff == NULL)
+        perror("out of memory.");
+    rewind(file);
+    fread(buff, file_size, 1, file);
+    fclose(file);
+    buff[file_size] = '\0';
+
+    if ((global_content = read_module(buff, module)) == NULL) {
+        perror("read module error");
+    }
+    return parse_global_module(global_content, key);
+    free(global_content);
+}
+

libconf.h

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+#ifndef LIBCONF_H
+#define LIBCONF_H
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <error.h>
+#include <unistd.h>
+
+char *read_conf(char *filename, char *module, char *key);
+
+#endif

test.c

@@ -0,0 +1,7 @@
+#include "libconf.h"
+
+int main() {
+    printf("%s\n", read_conf("test.conf", "global", "IP_SEGMENT"));
+    printf("%s\n", read_conf("test.conf", "global", "a"));
+    printf("%s\n", read_conf("test.conf", "http", "port"));
+}

test.conf

@@ -0,0 +1,7 @@
+global {
+    IP_SEGMENT= 115.60 115.61 115.62;
+    a= 100;
+}
+http {
+    port = 90;
+}