thodg/libgit2/examples/network/common.c

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• Hash : bf15dbf6
  Author :
  Date : 2017-11-06T12:47:40
  

  examples: network: fix Win32 linking errors due to getline The getline(3) function call is not part of ISO C and, most importantly, it is not implemented on Microsoft Windows platforms. As our networking example code makes use of getline, this breaks builds on MSVC and MinGW. As this code wasn't built prior to the previous commit, this was never noticed. Fix the error by instead implementing a `readline` function, which simply reads the password from stdin until it reads a newline character.

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• examples/network/common.c

• #include "common.h"
  #include <stdio.h>
  #include <string.h>
  #include <errno.h>
  
  /* Shamelessly borrowed from http://stackoverflow.com/questions/3417837/
   * with permission of the original author, Martin Pool.
   * http://sourcefrog.net/weblog/software/languages/C/unused.html
   */
  #ifdef UNUSED
  #elif defined(__GNUC__)
  # define UNUSED(x) UNUSED_ ## x __attribute__((unused))
  #elif defined(__LCLINT__)
  # define UNUSED(x) /*@unused@*/ x
  #else
  # define UNUSED(x) x
  #endif
  
  static int readline(char **out)
  {
  	int c, error = 0, length = 0, allocated = 0;
  	char *line = NULL;
  
  	errno = 0;
  
  	while ((c = getchar()) != EOF) {
  		if (length == allocated) {
  			allocated += 16;
  
  			if ((line = realloc(line, allocated)) == NULL) {
  				error = -1;
  				goto error;
  			}
  		}
  
  		if (c == '\n')
  			break;
  
  		line[length++] = c;
  	}
  
  	if (errno != 0) {
  		error = -1;
  		goto error;
  	}
  
  	line[length] = '\0';
  	*out = line;
  	line = NULL;
  	error = length;
  error:
  	free(line);
  	return error;
  }
  
  int cred_acquire_cb(git_cred **out,
  		const char * UNUSED(url),
  		const char * UNUSED(username_from_url),
  		unsigned int UNUSED(allowed_types),
  		void * UNUSED(payload))
  {
  	char *username = NULL, *password = NULL;
  	int error;
  
  	printf("Username: ");
  	if (readline(&username) < 0) {
  		fprintf(stderr, "Unable to read username: %s", strerror(errno));
  		return -1;
  	}
  
  	/* Yup. Right there on your terminal. Careful where you copy/paste output. */
  	printf("Password: ");
  	if (readline(&password) < 0) {
  		fprintf(stderr, "Unable to read password: %s", strerror(errno));
  		free(username);
  		return -1;
  	}
  
  	error = git_cred_userpass_plaintext_new(out, username, password);
  
  	free(username);
  	free(password);
  
  	return error;
  }
  

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