HP NonStop SQL/MP Programming Manual page 257

Dynamic SQL Operations
Example 10-8. Detailed Dynamic SQL Program (page 16 of 22)
913 /* ---------------------------------------------------- */
914 }
915
916 /* ---------------------------------------------- */
917 /* Allocate memory for the data buffer and assign */
918 /* byte address of the data buffer to var_ptr of
919 /* sqlvar[i]:
920 /* ---------------------------------------------- */
921 sqlda->sqlvar[i].var_ptr = (long) (malloc (mem_reqd));
922
923 }
924
925 return (0);
926 }
927
928 /* ***************************************************
929 /* FUNCTION allocate_sqlda
930 /* This function allocates (using malloc):
931 /* an sqlda structure with 'num_entries' entries;
932 /* the function also initializes the sqlda and sqlvars. */
933 /*
934 /* Return codes: sqlda pointer if successful
935 /* NULL if failure
936 /* ***************************************************
937
938 sqldaptr allocate_sqlda ( int num_entries )
939
940
941 { /* begin allocate_sqlda */
942
943 /* local variables */
944 sqldaptr sqlda;
945 int mem_reqd;
946
947 short i;
948
949 sqlda = NULL;
950
951 /* return NULL if 0 entries requested */
952 if (num_entries == 0)
953 return (sqlda);
954
955 /* allocate sqlda */
956 mem_reqd = sizeof( struct SQLDA_TYPE ) +
957
958 if ( (sqlda = (sqldaptr) malloc (mem_reqd)) == NULL )
959
960 return (sqlda);
961
962 /* Initialize sqlda; constant sqlda_eye_catcher is defined
963 /* by the C compiler and is always 2 characters:
964 strncpy( sqlda -> eye_catcher, SQLDA_EYE_CATCHER, 2);
965
966 sqlda -> num_entries = num_entries;
967
968 /* Initialize ind_ptr to NULL. ind_ptr must always be */
969 /* initialized, even when the program does not handle null */
970 /* values */
971 for (i=0; i < num_entries; i++)
972 sqlda -> sqlvar[i].ind_ptr = NULL;
973
974 return (sqlda);
975 } /* end allocate_sqlda */
HP NonStop SQL/MP Programming Manual for C—429847-008
/* switch statement */
/* for loop */
/* successful buffer allocation
/* end: setupvarbuffers
/* number of sqlvar_s entries
((num_entries - 1) * sizeof( struct SQLVAR_TYPE ));
10-59
Detailed Dynamic SQL Program
/* pointer to be returned*/
/* num bytes required to */
/* allocate sqlda
/* loop index
/* init pointer
/* memory allocation failed */
/* return error condition
/* successful allocation and init. */
*/
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