diff options
| author | Arthur de Jong <arthur@arthurdejong.org> | 2006-10-31 13:18:49 +0100 |
|---|---|---|
| committer | Arthur de Jong <arthur@arthurdejong.org> | 2006-10-31 13:18:49 +0100 |
| commit | 0fd56fe921624596d2cdca7b42e048e63570d8d6 (patch) | |
| tree | 9c986b74c2ff77fd07ac6b268d85d42489755a51 /nslcd-common.h | |
| parent | fe8fb00dd57714528535de7e3a8d42f64e7a79aa (diff) | |
add header file defining read and write macros
git-svn-id: http://arthurdejong.org/svn/nss-pam-ldapd/libnss_ldapd@35 ef36b2f9-881f-0410-afb5-c4e39611909c
Diffstat (limited to 'nslcd-common.h')
| -rw-r--r-- | nslcd-common.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/nslcd-common.h b/nslcd-common.h new file mode 100644 index 0000000..c08050e --- /dev/null +++ b/nslcd-common.h @@ -0,0 +1,84 @@ + +/* common macros for reading and writing from streams */ + +#ifndef _NSLCD_COMMON_H +#define _NSLCD_COMMON_H 1 + +/* WRITE marcos, used for writing data, on write error they will + call the ERROR_OUT_WRITEERROR macro + these macros may require the availability of the following + variables: + int32_t tmpint32; - temporary variable + */ + +#define WRITE(fp,ptr,size) \ + if (fwrite(ptr,size,1,fp)<1) \ + { ERROR_OUT_WRITEERROR(fp) } + +#define WRITE_TYPE(fp,field,type) \ + WRITE(fp,&(field),sizeof(type)) + +#define WRITE_INT32(fp,i) \ + tmpint32=(int32_t)(i); \ + WRITE_TYPE(fp,tmpint32,int32_t) + +#define WRITE_STRING(fp,str) \ + WRITE_INT32(fp,strlen(str)); \ + WRITE(fp,str,strlen(str)); + +#define WRITE_FLUSH(fp) \ + if (fflush(fp)<0) \ + { ERROR_OUT_WRITEERROR(fp) } + +/* READ macros, used for reading data, on read error they will + call the ERROR_OUT_READERROR or ERROR_OUT_BUFERROR macro + these macros may require the availability of the following + variables: + int32_t tmpint32; - temporary variable + char *buffer; - pointer to a buffer for reading strings + size_t buflen; - the size of the buffer + size_t bufptr; - the current position in the buffer + */ + +#define READ(fp,ptr,size) \ + if (fread(ptr,size,1,fp)<1) \ + { ERROR_OUT_READERROR(fp) } + +#define READ_TYPE(fp,field,type) \ + READ(fp,&(field),sizeof(type)) + +#define READ_INT32(fp,i) \ + READ_TYPE(fp,tmpint32,int32_t); \ + i=tmpint32; + +/* read string in the buffer (using buffer, buflen and bufptr) + and store the actual location of the string in field */ +#define READ_STRING_BUF(fp,field) \ + /* read the size of the string */ \ + READ_TYPE(fp,tmpint32,int32_t); \ + /* check if read would fit */ \ + if ((bufptr+(size_t)tmpint32+1)>buflen) \ + { ERROR_OUT_BUFERROR(fp) } /* will not fit */ \ + /* read string from the stream */ \ + READ(fp,buffer+bufptr,(size_t)tmpint32); \ + /* null-terminate string in buffer */ \ + buffer[bufptr+tmpint32]='\0'; \ + /* prepare result */ \ + (field)=buffer+bufptr; \ + bufptr+=tmpint32+1; + +/* read a string from the stream dynamically allocating memory + for the string (don't forget to call free() later on) */ +#define READ_STRING_ALLOC(fp,field) \ + /* read the size of the string */ \ + READ_TYPE(fp,tmpint32,int32_t); \ + /* allocate memory */ \ + (field)=(char *)malloc((size_t)(tmpint32+1)); \ + if ((field)==NULL) \ + { ERROR_OUT_ALLOCERROR(fp) } /* problem allocating */ \ + /* read string from the stream */ \ + READ(fp,name,(size_t)tmpint32); \ + /* null-terminate string in buffer */ \ + (name)[tmpint32]='\0'; + +#endif /* not _NSLCD_COMMON_H */ |